Javi

Try factory resetting the bulb from the hue app first.

I've used OpenSprinkler for years, and am the author of the same Plugin. OpenSprinkler works great for the most part, and much better than non-connected controller.  It has fallen off the WiFi network a few times in the last 5 years (like many WiFi devices) but the programs are local so they still run, just needed to restart and it would reconnect. So I would recommend getting the ethernet adapter if that is an option in the controllers location. 
There are no "hacks" needed to connect to eisy and no cloud service.  eisy will act as the remote access so no need to open/forward ports or have a static IP or Dynamic DNS service.

Thanks for the report, I'm building 1.1.60 now, so just need to await Apple's processing/approval.
Issue caused by architecture changes.  A display node is now a group of nodes, although only one is shown to the user in the Favorites Editor.

Try reboot eisy, then synchronize UDM.

It can be a program, but be sure the "Command" is executing the correct command. Commands are Run IF, Run Then, Run Else, and Enable (Enable enables or disables a program, it does not run the program).
However if using the occupancy Node Server UD Mobile should update the node see https://wiki.universal-devices.com/index.php?title=UD_Mobile#Occupancy_v2.0_Node_Server
Likely a programing issue. I would remove all variables and use the Occupancy Node as the trigger, see link above.

It is likely an invalid URL, be sure is starts with "https" and ends with "/desc".  Local connection can also be used with the http:<ipAddress>:8080/desc where IP Address is replaced with the units local IP Address (i.e. something like 192.168.1.65).

If a device is not writable then eisy cannot communicate with the device, this can affect any scenes with the device, so likely all related.
Try air gapping the device (pulling tab out until it stays) waiting some time then reinserting the tab.  Or factory reset the device.

Some of the Favorite Types require that the Display Status is linked to a command, i.e. toggle needs to know status to send the opposite command.
Command Type doesn't require a Display Node or Display Status.  If need the Display Node Can be removed by clicking Display Node then pressing delete (top right) on the Node Selection Dialog.

Thanks, please try upgrading UD Mobile to version 1.1.54 which should fix the Firebase dependency crash.  Version 1.1.54 was approved for production release this morning and beta yesterday.

The latest version of PG3 added a permission for apps which access eisy which may be related.  Is this check box available on enabled in the Node Server's configuration on web?   

Both items are on our list in one way or another, although not sure on timeframe.  

In short this is an insteon limitation with non-load bearing KPL Buttons. See Known issues: https://wiki.universal-devices.com/UD_Mobile#Scene_Estimated_Status . I updated Known Issues, but this issue has been discussed at length in the forum, so a search may shed light on some more detail.
Not Possible, the only way this would happen is if you turn the Scene off/on not the Dimming Device...the scene cannot be dimmed to a percentage from the admin console.  Even if using the "DIM" button a non-load bearing KPL Button will not turn off.
It has always been possible to control a physical device outside of a scene. For example KPL buttons and fanlink commands (low,med.high,off), would be close to impossible.

Tapping the indicator (triangle) next to the command parameter name (i.e. Group, Sound, Content) changes the selection from predefined values to variables.  This is how all programs behave and allows for saving a status to a variable then sending that status as a command parameter.   This works with integer variables as all Status and Command values are static and enumerated at a lower level.

On our list, but we don't have a time frame.
Also see the following for limitations:
 

Changed 100 to 200 on Wiki.    Too many false exits with 100 meters, although it may need to be much greater depending on location to avoid false exits.

Should be live now. 
Issued caused caused a race condition when  returning from backup dialog (System file selector) which briefly restarted subscription (value population). This caused removal the newly populated values along with removal of unused values.

Wifi is not available while ethernet is  connected.   Set Wifi credentials from UD Mobile > Settings Tab > WiFi Configuration.

Because all status values in ISY are represented as numbers. While it is possible there are negative values this is not very common so negative was omitted for globals, but can be set in custom mappings.  Most dimmable lights/switches have values 0 (off)-100 (full on). Most non-dimmable lights/switches have values 0 (off) and 100 (on).  Globals may not work well with devices which do not conform to 0 (off) and greater than zero (on).
I don't think the Node Dashboard screen Scene Members section incorporates colors of any type, but the same device should have a color in the Node List or in Favorites.    This screen has not changed much since release, so it is due for a upgrade, I'll try to get colors in at that time.
Programs will always have the positive color as they do not conform to 0 for off and greater than zero for on.  They have 4 common values Idle-true, Idle-false, running-then, running-else.  Adding globals for programs is on my list, although it has lower priority to other features.
 

Yes see https://wiki.universal-devices.com/index.php?title=UD_Mobile#Migration
Jump down to about 8 lines to 
Finally migrate your favorites and settings in UD Mobile. First backup UD Mobile from Settings-Tab > Backup in case of errors this way Favorites and User Preferences will not be lost.

Without seeing the Notification Content I'm only guessing, but I think this is the keep alive setting. Older versions of Android required a persistent (non-swipeable) notification whenever an app was running in the background. Then there are a few versions which required the notification but allowed users to swipe it away. The newest versions of Android show this in another setting (bottom of expanded settings in Running Apps).
The default was "1" or "2", so the Notification should disappear 1 or 2 minutes after closing the app.  The setting is intended for only a few minutes,  none ("0"), or negative (infinite).  The issue with none ("0") is switching between apps will kill the connection, so on return there could delays while UDM refreshes values.
If you are on a good internet connection and have a  small/med system you may not notice any difference between 0 or a few minutes.  If you are on a poor connection, have a large system, or have multiple systems connected to UDM then refresh may take a few dozen seconds.
Android OS also allows users to hide these persistent notifications in Android settings if you truly want the app to run in the background and not see the notification. If I remember correctly long pressing the notification will show which types of UDM notification channels to hide.
It is also possible that some versions of android do not remove the notification after closing. If this is true, it has not been reported.

1.1.49 removed the ability to hide systems nodes on the home tab, so they were likely hidden prior to this release.
I'm pushing version 1.1.50 now which should show root nodes even if hidden.  Google play has been publishing updates between 2 -12 hours, so try checking for an update later today.

Is the app working, besides the error during synchronization?
The error appears to show an empty file. If the app is working, then it could be that Node Server needs to be configured before this file is populated.

Ok, thanks.  I cannot replicate this on my side. 
Please remove, then try again.

I've added an issue to our list to add a single section to view available updates.  Not sure about time frame.
https://github.com/UniversalDevicesInc/UD-Mobile-iOS/issues/93

Please send me a PM with the app's backup and I'll take a look. Alternatively open a ticket and include a zipped copy of the app's backup.