Hi,
I see this is an old thread but I appear to be having a similar issue - although I have tried all of the remedies listed above without success.
On my main computer, the admin console is unable to launch. After I log in the GUI appears for a second, then closes down.
I do not have any issue from my laptop - so the issue is either with Java, the browser, or something else.
I have tried deleting the casche, I have un-installed and reinstalled java, I have ensured that I am running the latest firmware on my ISY994IR Pro. I have tried both Firefox (latest) and IE but nothing seems to work.
Can anyone suggest something I haven't tried?