You windows get error when you right-click file and select properties if the file is in zip, ftp, snapshot or in package.
You get double paths if you select the same zip, snapshot or package file two times.
Example: select package "c:\test.pkg" then select the same package file again. Result "c:\test.pkgc:\test.pkg"
I always get the same error mentioned here http://www.grigsoft.com/forum/viewtopic.php?t=985 when I sync with packages.
Couple bugs
I forgot one bug. The area where the Synchronize button is, is resizable. See the screenshot. http://i4.tinypic.com/15r07wo.png I don't think it's intentional.