Nicolai, I'm having the same issue now, getting 0 byte "image" files from snapped photos 90% of the time. (I did get it to work once, but I'm not sure how/why.) I tried doing a re-install of the fcam-drivers and the camera-ui package, and it didn't help. The odd part is, Bless and FCam work just fine. And camera-ui snaps the photo, shows the preview, and correctly names the file, it just has no contents.

I've tried using the stock voltage profile and my slightly tweaked one. I'm using k49 & CSSU... so yes, it's quite customized. I've tried saving both to internal memory and the uSD card with identical results. One other interesting side note is I'm finding it's not saving settings either. I turn on GPS tagging, but each time I reboot it's off again. Maybe it's a gconf-based issue?

Since I don't use the camera that often, and can still use FCam/Bless if I need to, I'd be happy to offer debug time if you like. I can run a custom version, turn on debug output, maybe even give you an IP to ssh into to check it out if you think it would help. Worst case I can always revert to the old UI, but I really do like the one you've made, minus the part about it not saving pictures.