repeated "An illegal choice has been detected. Please contact the site administrator." error, cannot fix

I installed 7.x-2.0-alpha1 and enabled about 30 fonts.

(I know this is not advisable, but I was attempting to do local development with a ton of fonts installed, then disable the unneeded ones before launching the site)

Now anytime I visit the admin page to de-select fonts or enable new ones I get a repeated: An illegal choice has been detected. Please contact the site administrator. error. (It lists it 11 times if that is of any use.)

Watchdog logs show a series of pass by reference errors after browsing on the the GFonts admin page.

I tried disabling then re-enabling the module, clearing the cache, logging out then in, closing browser then reopening etc. to no avail.

If I visit the admin page, change nothing, then hit save, I still get the error.

I was thinking about deleting the DB tables manually, but can't find them? I think the values are stored in the "Variables" table?

I also can't use the module uninstall feature, and I'm guessing this is not supported by this module?

Any suggestions or pointers of what else to try? If this is in fact a bug, I can help provide any data, not sure if it is.

Thanks,
Chris