Is there a length restriction on annotation type comments?
I just annotated one thing twice, clicked 'OK' - and it was dismissed twice (without visible error message)
Refreshing screen and flipping between pages did not help - the annotation is definitely not there...
Update: it only works when I mark a very short area (one word) and write a very short text... maybe an overall limit on the length of all annotated passages? (that would be a bit silly...)
Update: Turns out that the SD card was full... which brings me to two *very* important feature requests (please point out to me, if I overlooked the options):
- Option to display current free/used storage space
- Warning when running low of storage space
I'll have to see whether all my annotations were saved... if I lost annotations due to a full card, that'd be about 1/2 a day of work lost <- so I deem the features _very_ important
Update: I actually did lose some work (although I was lucky and it was only ~15min. - but I mind that there was no way of knowing during editing, because my scribbles even appeared - they were just not saved afterwards

) ;
Interestingly, I still wasn't able to add 'annotation' style comments after freeing space on the SDCard... so I/someone should check that issue out *sigh*
On the positive side, I realized that merged PDFs do not only merge the highlighting, but also the comments for the annotated items... so it's possible to continue editing on the PC :P