Using acad 2007 (6 seats) on a network. For convenience and sanity I decided to put all our custom tool palettes on the server, and change everyone's options to look there for the palettes. This has worked well for a few months, however, now there is a problem. the tool images keep disappearing from the palettes - to be replaced with a white square. The tools still work. The pairs of images are still in the appropriate directory on the server, and if you right click on the tool image you have the option to refresh the tool image, which works,,,, for a while (until restart i think/suspect). Does anyone have any idea as to what may be causing this?