I can't believe this isn't already on a list somewhere (i've searched!) or, it's just something about my set-up but...
When using a dual monitor set-up (MacBook Pro with 17" LCD) if i edit and save a patch with the window on the external monitor, then disconnect it and open the file again the window doesn't appear on the remaining (built in) screen.
If you it as save as text, then edit the vpatcher agruments to have positive values the patch will open and it can be re-saved, but this sounds like a fairly simple bug (unless it's just me) so next time someone's in that bit of code maybe they can have a look (please).
No biggie as i have a work-around - keep up the good work!