Gil,

I need more info, like:

What are you naming the category? Have you tried using another name for the category?

Specifically, what is happening? Do you see the status bar reporting anything?

What are the URLs you are trying to install?

Do you have the Tag Cloud turned on and aren't waiting for it to process? It can take a while if you have a lot of pheeds.

If you still have trouble, exit tuelz.exe, restart tuelz.exe, check for the problem, if it exists, open tuelz.log and email the contents to me, but only AFTER you've checked the other things.