Hello, I am experiencing an issue with the latest build of WSA and Sandboxie v4 + Firefox. Before getting into details, let's mention that until mid July, the combo "WSA - FF - Sandboxie" had been working fine on my PC for a long time. From mid July to this week, I didn't use my PC. Yesterday, I got Win7 x64 SP1 reinstalled on a new hard drive. I then reinstalled (in this order) Rollback Rx, WSA 22.214.171.124, FF22, and Sandboxie 4.04. With this setup, here is the error message I get repeatedly in a popup every time I launch FF in Sandboxie: SIBE2203 Failed to communicate with Sandboxie service: GUIPROXY_00000001 -firefox.exe [C0000061] Here are some tests I did: First part: Tested Internet Explorer 10 (32 bit) with Sandboxie... with the same results. However, Opera 15 works fine (no popup). Second part: Using Rollback Rx, I then rolled back to a snapshot I took before installing WSA and Sandboxie. Installed Avast! Free instead of WSA, and then reinstalled Sandboxie 4.04. Result: No popup when I run FF or IE sandboxed! I already reported this issue in the Sandboxie forum, but since WSA is the only program that was updated very recently (the latest builds of Sandboxie and FF were released before mid July), I also have to bring it up in this forum. Thanks p.s.: I am really looking forward to see WSA and Sandboxie get along again!