Every time I start Firefox 8.0.1 it repeats the add-on compatibility check

Hi there
I'm using Vista and since updating to Firefox 8.0.1 every single time I start Firefox it repeats the add-on compatibility check.
I tried starting with add-ons disabled, deleting update files, started with different profile, nothing.
Is this a bug and we have to wait for another update or if it can be sorted I would appreciate some help please.
Cheers

Go to Firefox/Help/Troubleshooting, and in your Profile Directory/Open Profile Folder. Close Firefox (File,Exit) and on your Profile Folder look and delete this file "Pref.js" and any other "pref" files in there. Start Firefox and your preferences are reset to default. Go to Options and customise your preferences as you had before.

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