Can't open .xls files created by Numbers

All of a sudden, using Numbers '09 I can no longer open certain .xls files that I created in the first place by saving .numbers files as Excel files (using the "Save copy as Excel Document" checkbox in the Save As... dialog box). Some will open, but the vast majority attempt to open, and then I get an "Import Error - An unknown error occurred." message. Backed up copies of the same files produce the same result. New .numbers files I save as Excel documents can't open either.
Background: Earlier tonight while saving a .numbers file as an Excel Document, the blue "progress" bar got about halfway and then just hung there. Having not rebooted the computer for a couple of weeks, and lots of apps open, I proceeded to shut down other processes and eventually the blue progress bar finished and an Excel file was saved. However, after rebooting the computer, the above inability to open Excel files started to occur. Something in the "save as" process must have corrupted?
I quit Numbers, deleted the com.apple.iwork.numbers.plist file from Library/preferences, emptied trash, and restarted Numbers -- but that didn't solve the problem.
What would you all suggest now at this point? Would reinstalling Numbers solve this? (hmmn, where is that disc?) I'm personally fine with the .numbers format, but my clients are not, hence the need to save as Excel documents. Any help would be appreciated!

ack, this whole thing is frustrating. I can create new .numbers documents, save them as Excel documents, and those resulting .xls documents will open fine. HOWEVER, if I grab an old .xls document from a time machine backup (over a month ago), I cannot open it. Nor can I open an newly saved .xls document saved from the same original .numbers file.
It would seem that the only thing I can do now is take those old .numbers files and copy/paste the content into a brand new .numbers file. After saving as, the resulting .xls files open fine (with the usual "import warnings", but I'm used to those )

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