I was in the default server area and was asked if I wanted to download the texture pack. I said "yes" but when I go to the main server, it just causes my texture pack to revert to minecraft default.

How do I get my own texture pack working again in MT?

Go into your menu, and go to 'Video Settings' There should be a button that says 'Server Textures'

Turn that to off

You may need to go back to the texture pack window and select the one you usually play with and you will be good to go!

That's exactly what I needed.

Thanks so much!