What computer operating system is involved?
In Premiere Elements 11...what is the focus point for the problem
a. The YouTube Panel does not expand so that you can see Presets field
b. The YouTube Panel opens, you see Presets field, but you cannot open the list of Presets to select the preset you want
What is your project preset, the frame size, frame rate, and duration of your Timeline content?
Do you have the latest version of QuickTime installed on your computer along with Premiere Elements?
Are you operating the programs as administrator?
Have you tried exporting your Timeline to a file saved to the computer hard drive and then from there uploading the file to YouTube at the YouTube web site?
Is this a "it worked before but not now" or "it never worked before" issue?
Let us start here and then decide what next.
Add On...does the problem exist with and without the antivirus and firewall(s) disabled?
Thanks for the reply giving us the name of your computer operating system.
Please review my reply 1 and, when your schedule permits, please reply to the other questions as well.
This will enable us to rule in or out factors which may be causing your issue.
It may get to the point where it will be indicated to uninstall the program, do a free ccleaner run through (regular and registry parts), and reinstall with antivirus and antivirus disabled. We are hoping that it does not get to that and that we can spot problem area without having to go the uninstall route.
Looking forward to your details to help us help you.