Problem with disappearing files with AV sw

[HRZ_peter]

Dear Sandboxie-team!

I just recognized a problem between Sophos Antivirus and storing possibly infected files. Here's what I see:

1.) Thunderbird is running under Win8.1EE in sandboxed mode (yellow border is visible)
2.) I try to store a ZIP-file (possibly infected)
3.) Thunderbird queries filesname and location (User's "Downloads" folder)
4.) Sophos AV tells a file is under quarantine
5.) the file is neither in the sandboxed folder nor in the "real" folder - may Sophos prevented creation/storage of possibly quarantined file
6.) now the funny thing with Sandboxie: sandboxie asks where to store the not existing file

Maybe this behaviour is intended or faulty, it has pros and cons... (maybe I should also open a ticket at Sophos)

With regards,
Peter.