@the dot

sorry for the delay - disabling Gmail Addons for the weekend provided relief from the slowdown/script stop. So (at least on my instances) the script is causing the error.

this may be of use though - your suggestion:
"another thing that might help is if you reported the number of times the word 'poll' turns up in the error console."

On load, with the script enabled, I saw 3 instances of the poll in the error console, with an ADDITIONAL 3 instances everytime I changed folders within gmail. According to your post, this seems high. Any ideas?

Thanks again.

(Know this has been added before, just trying to give more info)

Getting a lot of hangups and non-responding firefox - telling me the "script on this page is busy or has stopped responding..." Options to stop script or continue.

Have disabled all other gmail/google/calender plugins to make sure there are no other conflicts. Have reproduced on multiple computers running Firefox 2.0.0.12