Is it not always the way?  Five minutes after I posted my previous question in desperation I found the registry entry which holds the persistent data. 
 
In case anyone else gets this problem, this is created the first time you exit the product with data in the panes, but is not being removed on an uninstall.  The key is:
 
HKEY_CURRENT_USER\Software\Edi Weitz\The Regex Coach
 
I uninstalled the product, removed the key (using regedit), reinstalled, and everything was fine.  I could probably have just removed the 'Panes' sub-key without reinstalling the product.
 

Clive Darke
Product Consultant

QA
Vale House Pynes Hill Exeter Devon EX2 5AZ
 

Email       clive.darke@qa.com    
Web        http://www.qa.com/



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