xmarks seems corrupted somehow, uninstall/reinstall does not fix

On my netbook, which I hadn't used in a while, I noticed that xmarks was out of date. I installed the latest version and tried to run it. And keep getting sync errors.

Strangley in the settings window. if I check the box to say "save my password between sessions" -- Then clicking OK does nothing. Only if I uncheck that box, can I get the settings window to close by clicking OK.

I uninstalled, and reinstalled -- but the initial setup window did not come up, and it already had my username, so I guess it does not really fully uninstall.

When I try to run initial setup manually, or when I uncheck and recheck sync password, I enter the PIN, and then click next, and then it says PIN verified or whatever -- but the Next button is then greyed out, and I can't do anything.

If I try to uncheck sync password, and then click OK, and then reopen settings window, the box for sync passwords is checked again.

Please help!