The guys at Youtube ran some maintenance on the website today but it seems that they messed up a few things:
1) If you try to upload a video larger than 100MB you normally get a javascript pop-up message saying for example “The video file cannot be bigger than 100megs.”
Well here’s what pops up now:
UPLOAD_LIMIT represents the max size of the file that can be uploaded.
2) When i used used the Multi-video Uploader even though i had the Youtube Uploader installed it gave me the error message: “Youtube video uploader is not running - you will be redirected to upload page” on this i said to myself WTF? and i rechecked that is it installed, and yep it is installed.
I pressed the OK button and it threw me to upload page where i got the popup message “Uploader successfully installed - redirecting to upload page” and by this way it kept throwing me from upload page to installer page.
I reported the bugs at youtube and most probably they will be fixed shortly 
Hello, and welcome to my blog. My name is Tom and i am the owner of thaslayer.com. I'm 18 years old and currently in college, but also work as a freelance web designer. As you can see in my portfolio i mostly design wordpress themes, but i can handle any other design related job
Posted: Jan 21st, 2008 at 6:01 pm
Great find. I am glad you know how to report bugs. I just wanted to say these errors mean youtube has some lazy programmers/qa testers. Since it is free, what can you do?
Posted: Jan 23rd, 2008 at 5:21 pm
I got the same error and after being redirected back and forth 20 times i just installed the uploader again without uninstalling the 1st instance of it and it has been working fine since.
Posted: Jan 23rd, 2008 at 6:05 pm
Sorry scratch my previous post. I was able to upload a video somehow so that is why i thought it was working but it seems to be broken once more. I’ve reported it as a bug as well so hopefully they will look into it.