On my Treo 650 with 150X Ridata 2GB SD Card, I tried to use Documents to Go for the first time with a few ppt files. HotSync hung on "Checking for updated documents".

I tried saving the docs to memory instead of the SD card, and it worked. I then moved all the docs to the SD card using Docs To Go menu. After that, syncing works fine even though the documents are now on the SD card.

It seems that the first sync to an SD card is the root of the problem.