Gaming Tumblr Dashboard Themes?

[Sora de Eclaune]

I'm trying to get some Tumblr dashboard themes to work. It's working, just not CORRECTLY. The themes only enable themselves when I click back on Tumblr, and do not navigate to any other page on that tab for the rest of my browsing session.

I'm using Windows 7 64-bit with Firefox and the latest Greasemonkey. Can anyone tell me what I can do to fix this?