I've just started to use moodle, so this has always been the case since I installed it last friday. This is the first time I am configuring moodle.
I have a great number of non-standard themes in my directory, mostly because I've been uploading and trying different themes to see if I can get one to work. If it is helpful, I can remove all but one of them. Here is the current list (and I am aware a few of them are moodle 2.0 themes; it took me a little while to realize that my webhost installed moodle 1.9 rather than 2.0)
The list:
MemMed_Main_Theme
aardvark(2.0 theme, my bad)
aardvark-stc
aardvark-stf
aardvark_pro
aardvark_pro 2
afterburner
beaux
beaux_purple
college_red (the menu in this one sort-of renders, but the text is invisible)
edulabs-green
gekko
gekko_twopointoh (moodle 2.0 theme, again, my bad)
ingenuous
melbourne
mymobile (moodle 2.0 theme, did not try this one)
newburycollege
zebra
I am using a host server (1and1) AND their 1-click install of moodle. I am not happy with that, but I could not install it myself because I don't have access to anything outside htdocs to securely create the moodledata folder, and I couldn't get that part of the installation 
In any case, I uploaded the theme files directly to the theme directory via ftp. I assumed that when they showed up in my theme selector I had done so correctly, but perhaps I missed an obvious step (edit yadda yadda line in such and such a config file)?
I am in contact with my web server help desk about this error, but I spent an hour on the phone trying to explain what a debug console was, so it's not looking good. I really do appreciate your time.
Jamie Lynn
over.