Firefox doesn't always open in Sandboxie. About half the time, it fails to open. It is random, whether it opens this time or not. I usually have to delete the Sandbox, and try to open Firefox again. Sometimes I have to delete and restart up to 6 times before Firefox opens. And yes, I did check Task Manager to see if there is a Firefox process already open (there isn't) before I try to open another instance of Firefox. I have noticed this problem on multiple computers, running Win 7 Home Premium 32-bit and 64-bit, and XP Home. I have noticed this behavior in every version of Firefox after 3.6 up to and including the current version (19.0.2), and in the current version of Sandboxie (3.76) and several versions prior also.
It doesn't seem to happen under Windows 8 64-bit.
For the Windows 7 and XP computers, I'm using Windows Firewall and Microsoft Security Essentials.
For the Windows 8 computer, I'm using Windows Firewall and Windows Defender.
If I try to open Firefox outside of the sandbox, it opens fine. I only seem to have problems opening Firefox if it is sandboxed. Am I doing something wrong? It is happening on multiple computers, so I don't think it is a problem due to a bad install, or corrupted files. Is anybody else experiencing this problem? More importantly, how do I fix it, or is this a Sandboxie bug?