[HendryLee]

Glad to know it works for others, so I uninstall Flock, delete all the rest of the files in the profiles (saving my Scrapbook data first), reinstall Flock and the add-ons once again.

Now it works. I used to have a similar problem with Twitterbar, but a quickly reinstallation worked for that.

Perhaps it has to do with one of my add-ons, although I can't think of why it won't work when I disabled all them but SEO for Firefox the first time.

Thanks Ron, mine was set to automatic all the time. I forgot to mention that. The automatic options makes it slower, but I disable it by default unless I'm in research mode.