I made the observation, that processlasso is crashing, when I use TOR-Vidalia under WinXP.
When I use an XP-user-account without TOR-System, everything is doing fine. But with the other account, where TOR is automatic started with the login-process the processlasso-icon in the taskbar disappears after a while and cannot be opened until the next OS-Restart.
There is a known XP issue I'm working on with Lasso. I'm not sure what's going on with it, it's pretty bizarre.
It is a high priority fix. Please hold and I'll try to get it resolved as soon as I can.
In the meantime, turn on beta updates, that way if it continues to crash, you can send me a dump.
Or if it's fixed, then you have the fix right away.
You also have the option to go back to an older version. Maybe v6.0, I don't know what version to point you to because this bug is still being investigated.
My apologies for this!