Created attachment 10946 [details] file that can not be annotated the attachement is pdf file that can not be annotated in mupdf of android.
The problem seems to be that this file doesn't end in a newline which causes reparation to miss the first object in an incremental update. Adding a newline as in https://code.google.com/p/sumatrapdf/source/detail?r=8968 fixes this for me.
OK, since this problem is related to the MuPDF core, rather than Android specific, I'll remove the Android tags..
Fixed in: commit 1e91bb1c4b55060809154ff7ba6f210f74499c4b Author: Simon Bünzli <zeniko@gmail.com> Date: Fri Jul 18 15:16:06 2014 +0200 Bug 695271: fix incremental updates for files without final linebreak PDF documents aren't required to end in a linebreak. Objects however must start on their own line (in particular for broken documents relying on reparation). For this reason, a linebreak must be inserted before starting an incremental update.