Why no forums use vBulletin 4
 

Hi,
I'm a member in many forums over the internet, but so far I found no forum uses vBulletin 4.
They all use vBulletin 3rd generation.
Anybody knows exact why?

I'm using vBulletin 3, and I may upgrade it to 4.

That`s not true. Many forums runs VB4.
I have upgraded from 3.6 to 4.0.1
It was not without problems, but with today`s version (4.1.0. PL2) it should be easy task.
You can check 4.1.0 version @ http://www.vbulletin.com/forum/forum.php

or mine (croatian language) http://www.seljacionline-forum.com/

My forum run 4.1 and is very active

We're running a very success forum on 4.0.8, and will be upgrading to 4.1 in the next couple of weeks.

I am running VB 4.0.8

Pain in the bum when upgrading because not many of the mods were compatible so had to find new mods or upgrade existing ones. It is fine now all the hard work has been done. Will be upgrading soon to 4.1.0 soon.

http://www.sthelenschat.com

For example: why vBulletin.org hasn't upgraded to vB 4 yet

Don't worry I got what you meant!

Maybe they think that there are too many bugs in it for now. (Just taking a guess here let me know if I am right)

Yes you're right.
In the past, I upgraded to vB 4.0.1 and I faced many problems and bugs, so I had to go back to vB 3.
I'm not sure about the quality of current versions of vB 4.

I have 3 vb sites all 3.8.
I wont upgrade any of them, I don't care for the 4.0 series at all.
The 3.8 series to me, is the best vbulletin has to offer.