Hi dmrunyon, houseofearnest,
We have spent the day working on fixing the broken WP plugin. For some odd reason it is still causing issues for some of our users. In my WP environment (version 3.5) the plugin (versions 1.2 & 1.3) works.
As houseofearnest mentioned, the only way at this point is to manually disable the ThingLink WP plugin by accessing your site via FTP and removing the plugin. I’ll post the instructions on how to do this as soon as I’ll be able to reproduce your issue. I can only ask for your patience in this matter. I’ll get back to you as soon as possible!
Regards,
Marko