-You're right, the bug is a memory issue, I've tested it. A warning message will be welcome before the memory goes to 0, great idea.
-I vote as well for a Curve and level correction tool and a advance Color to B&W converter.
Another suggestions for the next version :
1) Do not crop layers when we move them until we validate the new position, because when we test different positions, we loose parts which are outside the canava. I know, I can use UNDO button, but...
2) Rotation for layers
3) Lasso selection
4) Blur and Sharpen adjustable filter applied to a selection.
5) Ability to choose which app to use to explore folders when choosing pictures, because the native playbook pictures explorer is horrible
6) The last for the moment, but not the least (If it's possible on playbook), support for the great ADONIT JOT TOUCH.
Anyway, the app is already great, I love it. Thank's a lot for developping this, I was waiting a app like this for a long time.