Thanks Jaydon for helping to identify the fix. Uninstalling then re-installing does indeed appear to do the trick. Great catch!
We've also made a slight change to the tapjoy.com webservice which may have fixed the problem for users who didn't uninstall then re-install. If there is anyone who has previousl...y seen this problem but hasn't uninstalled/reinstalled, can you tell us if the problem is now fixed for you?
