Im loving the program this far, but every now and then i have this problem:
I create a new layer, and out of nowhere appears this white area as seen in the picture.

large version of the same picture here http://i.imgur.com/plxa8BL.jpg
Its not really serious problem as restarting program will solve it, but since i have no idea what causes it i thought i should let you guys know.
Keep up the good work

- Keppo