Saved file is not there. Opens with a blank workspace. Thumbnail shows the workspace. Can export and the image is there.?????

I have done some work.  Saved it as a .cdr file.  Came back later on and clicked on "open file", the windows box pops up showing the 'thumbnails of the previously saved work'.

So I click on one as usual, it loads up.  But the workspace is blank.  Where has it gone.   ARgghhh!!!!!1

If I export the blank workspace, it will save as a jpg etc and the image is still there.  I just can not see it in the workspace at all so I can no longer edit the work.

What is going on here?

Peter