Can only open the mail if its shown as incoming mail in the Google talk application. :(

Works in Chrome and Safari and it continues to happen in Firefox 4 beta.

Also..I am on a Mac and it's happening here too!

I was able to fix by opening Tools, Integrated Gmail and removing Calendar from Element Section.

Correction: Last post was by rudi, not Kenny... and I am using firefox 3.6.6

thx a lot, it works again.

I had the same problem too. Removing Calendar from the Element Section didn't work for me. But disabling the Firefox add-ons Integrated Gmail did!

same issue with Win XP removing calendar works

Same issue with windows 7, removing add-on integrated mail helps

I have the same problem, I can't read my gmail because the Agenda opens .... What can I do ?? olease help me !!! (firefox, vista).