Hi Achitots,
sorry to hear what troubles caused running Sync Dropbox tool if running in sandbox. DavidR summarized everything perfectly. Dropbox sync tool is a third party program, which is probably not developed by the official dropbox developers. Its binaries(junction.exe) etc contains many marks to be evaluated as a autosandbox candidate.If your case Dropbox and Sync tool ran in 2 different environments, dropbox in normal environment, sync tool in a virtualized environment. If you run Sync tool run in sandbox, all the sync operations are virtualized and could not be seen by the Dropbox process. Thats why dropbox could not see the changes made by the Sync tool.
I am now checking, why the files in the synchronized directory were deleted. There has to exist other not virtualized process of the sync tool which is doing this cleanup which led to the files deletion. I am investigating it now. I have also contacted virus lab to check, if Sync tool has to be evaluated as the autosandbox candidate.
sorry again for the troubles,
Michal
avast! QA