oh this happened to me when I first got desktop X
here is how you fix it:
1. when it asks you if you want to load a blank theme say
yes
2. once dx has loaded right click on its systray icon and click the "switch to user mode" button (if your not already in user mode)
3. Now load a theme.... dont load the one that was messing you up... it might be corrupted or somthing.
4. Now that you have loaded a theme click "restart desktop X"
5. It should load correctly now, if it dosen't load correctly in the future (or whenever the "desktop X has encountered a problem" shows up, just cut the power, thats what I always did because if you dont then it will always crash every time you load a complex object (scripted object)
if the problem continues re-install desktop X and make sure to restart (not just shut down) once the installation is complete)
ALWAYS STAY IN USER MODE UNLESS MAKING A THEME
good luck