Hi, I've seen several "Unknown Errors..." messages but not one on an AutoRecover file.  When this occurs, I can reboot my computer, load the drawing and everything appears to be fine.  Then, after working several minutes, the error pops up.  I get out of the error, do a hard rebuild and the assembly file that the "Unknown Error" was addressing, is missing parts of the assembly.  I've tried turning the AutoRecover off and changing the file path but nothing seems to work. Additionally, I can't make a high resolution pdf even though every setting I have to make a high res print is turned on (not just the views but the title block as well is low resolution).  Any help on what I could try would be greatly appreciated!