Just as a final follow up - the '.seen' files turned out to be a
red-herring.
In brief - if your 'cache' directory structure (i.e. for 'cyrus.cache')
does not exist, a lot of the command line tools will 'segfault' instead of
displaying something meaningful.
Sure enough - on the new server I'd set a separate meta-data partition,
which didn't exist (thinking it was just for squat files) - however a
config typo meant I was using:
"
metapartition_files: squat cache
"
Which was a 'fatal' error as none of the spool/user directories existed.
Fixing this up (removing the 'cache' option) restored the command line
tools to operation.
Regards & thanks to Bron for replies,
-Karl
