App does not work

Installed on my 2012 MacBook Pro . Have tried numerous times to edit a photo. The photo showes up but when you enter one of the editing modes, the photo looks like a bizare jumble of lines on a dark screen. Tried to get help form developer but so far no response. At this point I would rate the app a 0 stars. Hopefully the developer will respond and help me correct this problem. It is completely useless as is.

Stuart Blanton about Focus 2