Undo/Redo and Tools Issues, Hallucinations

I've tried using the Erase/Reverse eraser tool on and off for 2 days, starting the Nth project over again because the Undo/Redo either resets my entire last hour of work or the Redo totally forgets the last or all steps. In addition, it randomly goes into Crop mode and there is no way to delesect without X-ing out of the app. I'm really trying to give this a chance but I could have done this in Photoshop in 5 mins. I'll give this 5 more minutes, otherwise I'll wait until the functionality is more stable and user friendly.