When I click to start the app the screen goes black. I've rebooted my phone, cleared the cache and even reinstalled it with no positive results. Anyone else have that issue?

@Norman Vautour welcome to the Universal Devices forums. We mostly support the devices that Universal Devices supply (ISY994, Polisy, eisy). If you're working with one of those devices could you give us more information as to the app you're using and any screenshots if you have errors before the screen goes black. 

I use the Sensibo app. When I click on it, it opens as usual like it's going into the main page where my heart pumps are listed. But then how totally black. 

@Norman Vautour You'll need to find if Sensibo has a support forum. This area is for a Sensibo plugin that works with the Polisy or eisy product. It's not specifically for Sensibo product/app support.

Ok thanks.