I'm still running XP and get the same message about 2/3 times on open with Reader X. Also get crashes without warning or error message about 2/3 times when I click on Comment or Share, and when I click to open a file listed on the splash screen. about 50% of the time the files on the splash screen fail to open and I get an error message sayinbg the file is corrupt, but if I do a standard file open routine via menu the file opens OK.
I would guess all these are problems related to Vis C runtime errors, but where to start for a fix?? AR/X clearly has too many bugs and glitches in it to be usable in this version.
Much easier to uninstall AR/X and work google docs.