Text in drop-down menu not visible in one forum
 

I have moved my vBulletin to a new server. In one forum, the text in the drop-down menus is not showing. At all. In other forums, it is showing.

This is the view in one forum:

http://i597.photobucket.com/albums/t...wn-working.jpg

And this is the view in the other forum that is giving me the problem. Notice how the text in the drop-down box is not visible:

http://i597.photobucket.com/albums/t...ot-working.jpg

Thanks in advance for any help.