folders with new mail not discovered

[Geoffrey Leach <geoff hughes net>]

I run a script that feeds new mail into various folders in my mail  
directory.  I then depend on Balsa to discover new mail and highlight  
the folders.

For years this has worked well.

I recently moved my mail directory to a new system, via a copy-out  
copy-in procedure using a CD (ie permissions were lost and were  
restored).

Now Balsa fails to discover new mail. "Check for new mail" is set to 1.

Any thoughts?