to_late_to_quit

No – there was no other Dropbox plugin installed. I tested fresh installs of WP with different version numbers (WP 3.4, 3.5 and 4.0.).

Thanks for the quick reply.

No – I do not use another plugin that uses Dropbox.

I also tried different version of WP 3.4, 3.5 and 4.0. and get the same error.

this is the line in question (299):

$oauth->setToken($wpsdb_token,$wpsdb_token_secret);