Have you tried shutting your computer off? What I have done in the past when I encountered this problem: Work, copy and paste my work into a Word document. Work some more, copy, paste You get the idea.
Another thing I have done is to use the save new button on a listing that seems to rebel against being saved. Of course I have copied and pasted the description in Word first - just in case it didn't help. Hope this helps! Take care, INOUDID