Spark disappears

When I start spark it logs in the disappears from the screen and logs out. Anyone know a fix??

Are you positive it is logging out and not minimizing to the system tray? Delete your spark profile from your user account’s home folder on your computer (c:\documents and settings%username%\Spark), then try to sign in again.

It’s not in the icon tray It just freezes and the shuts down and disappears. Have erased log as you suggested

Did you delete the entire folder, not just the logs? If that does not work reinstall.