You facebook app id looks incorrect (I think it's just supposed to be 15 numbers, no characters). Please check those settings in your options and compare them to the settings on your facebook app.

I'm getting the same problem. I am running VB 4.0.4 on http://onlivefans.com
It's been working for over a year and then about 3 days ago when users click on the fbconnect button the normal popup window doesn't open.

Can anyone help me with this?

If you are running 4.0.4, then I believe you are going to have problems as the upgrade in the default software was done for 4.1.17 and above. You will need to upgrade, or download a later version and view the differences.

Lynne, why is it that it worked previously, and then all of a sudden stopped?
Ed

Lynne, why is it that it worked previously, and then all of a sudden stopped?
Rockinjay

My forum also has stopped popping up the Facebook connect. Nothing above clues us in on why this is happening or what to do about it.

I tried to follow the upgrade procedure for Fbconnect-3.05 and my forum was dead for a bit, until I reversed the process of installing.

http://annas-list.com/forums

I'm pretty sure this is related to the problem: http://developers.facebook.com/blog/post/614/

ETA: and here's at least one thread from vbulletin.com discussing the issue: https://www.vbulletin.com/forum/show...by-October-1st

mine is doing the same thing, just randomly stopped

Having the same issue, could it be a change within Facebook itself? Maybe the javascript file?

k, upgraded to 4.1.9 and it works now

Yes (see what I posted above). According to this thread: https://www.vbulletin.com/forum/show...by-October-1st a change was made in 4.1.8 to deal with it, so I think if your version is older than that it's not going to work any more.