Can't save files to a folder in my Dropbox (on my computer)

I’m running iStopMotion v 3.0.2 on a 6-month-old MacBook Pro running OS 10.8.3. Whenever I create a new iStopMotion file in a folder that’s in the Dropbox folder on my computer, the saved file is only 148 bytes. But if I create a similar file in another folder that’s not in the Dropbox folder, the saved file is fine. There are no alerts or warnings about saving the file - it appears to have saved normally. Using iStopMotion Rescue doesn’t rescue the file.

Has anyone else had this problem?

I tested the workflow as you described and it worked for me. Do you use a certain DropBox-Folder or just any regular one?