I today upgraded one of my MT installations from 3.34 to 4.21. It all appears to have gone well, except that I have one strange display in the control panel. In short, the drop down for the blogs is not displayed right. I’m unclear what needs to be looked at here to fix the problem. Take a look at this picture I took of the control panel, so you can see what I’m talking about. Thanks for any info you can give.
http://www.3drealms.com/3drnews.png
Reported on Movable Type 4.2

Did you copy the 4.21 files over 3.34? If so, try using a fresh 4.21 installation (backup your old MT directory and replace that directory with the new, fresh copy of 4.21). It's more likely something on the file system than in your database.
I just did that. Nuked my old directory (which was upgraded from 3.34 to 4.21 by copying files on top). Completely virgin install of 4.21 straight out of the tarball, with one exception. The config file. No change. That display issue is still there.
Tried dumping my browser cache, rebooting Firefox, no change. Tried in MSIE, no change there, either.
What happens if you use the System menu (top-right, next to your username) to navigate to the list of your blogs, then browse between a few of those? The drop-down should populate with other blogs that you've visited. It's either this or there may have been a problem with some of the files you uploaded (like the graphic for displaying the drop-down arrow here). When you click on that tab, does the drop down appear?
Come to think of it, I had a similar thing happen to me when I had only one blog in a test installation of Movable Type. I had to access the system area through the menu on the right hand side.
Brad, there's three "blogs" that comprise this installation. I used that dropdown next to my name that you refer to, and went to all three of them. No change. The missing image is still not there.
The files on the server are there directly out of the tarball I downloaded. Sent up said tarball, and untarred it. I couldn't have "uploaded" it wrong, as I didn't technically unload any specific files.
FYI, the functionality seems unaffected. I can use the dropdown that is missing, I just can't SEE it.
Do you have blog-selector-arrow.gif in mt-static/images?
Yes, I do.
http://www.3drealms.com/mt/mt-static/images/blog-selector-arrow.gif
I found out why. I apparently had an old htaccess redirect that this image triggered. I obviously had the trigger set up wrong. I discovered this when I tried to view the image after seeing it was there, and got sent back to the main page of my site.
Here's what was flagging it.
RedirectMatch /blog.*? http://www.3drealms.com
I commented out that line from the htaccess, and it works fine. That's where the problem was. That redirect is on there for something that hasn't been on our website (which resided at /blog/*) in many a year, so I just left that line commented out.
Gotta love mod_rewrite...