Great app but....

I have downloaded this app several times and, it has worked for about a day. When I opened the app, it came to a grey screen. I tried zooming out to start a new page but, it just sat there like that. I dont know if its just on my devices but, if you can, please fix this bug.

CreepyPastaGurl1025 about Sketch Pad - My Drawing Board, v3.1