I installed and used Infinity Design for a few days. Everything was working fine. Lately the app is buggy as hell. - When I draw a line, it disappears as soon as I take the pen of the screen. If I press undo, the line shows up. - When I use the eraser a similar thing happens. I erase something, it disappears as it should, but then it reappears as if I didn't erase at all. - Generally the has been getting slower and slower and crashes randomly. It's a good design app, but it doesn't work properly