Thanks, I will do that if the need arises.
Cheers,
P

I installed the latest stable version Inkscape 0.91 r13725 and the problem seems to have gone away.
Unless someone is interested in trying to find out what the problem was, I think we can call it solved.
Thanks
Peter

I tried opening in an older version Inkscape 0.48.4 r9939 and it exported the same rectangle to png without any problems. Now that I think of it, I may have had the same problem and the same solution the first time I exported that rectangle. I opened the file in notebook and could not find the strin...

I tried to export a rectangle to a previously named file saved from the same rectangle on another occasion and got error "The chosen area to be exported is invalid" I tried deleting the rectangle and creating a new one of the same extents, but got the same error. I also tried exiting Inksc...