I did paint a background on tuesday evening, I could save witheout problems. Yesterday I couldn't open this project-file. Hmmm .... thats not the first problem, 1-2 months ago I did have problems to open my ARTRAGE Files too.

Maybe a hardware problem? But my computer runs very good, without problems. My S.M.A.R.T values are ok, and for my system I use a Intel SSD.
Wish you a nice weekend...
it seems to be good, to have maybe 2 separate project files. If one is lost, so you have a copy e.g. from yesterday. And so on -.- and this also for all my other projects/files ...

my system: intel7 - 2600k, gtx 970, dualboot windows 7 64 bit / ubuntu 14.04 lts
my deviantartpage:
http://zeropainter.deviantart.com/gallerymy youtube channel: zeropainter - ok, there are only 2-3 very short videos