scholartime,
This error message comes up when our site is being reloaded, which usually takes 2 or 3 minutes, and, over the past week, it's needed to do so about every 4 or 5 hours.
To avoid losing your description data if this occurs when you try to post or save a listing, you may want to copy/paste your description into a word document just to make sure you won't lose it if you hit a server error.
-Mike