[Hat] Strange error using hat-trail and hat-observe

[Thomas Davie]

I'm getting a very strange error when I run either of the main two hat 
utilities:

dhcp2966:~/Documents/Work/SECD Machine tatd100$ hat-trail SECDmachine

Fail: /tmp/hmakeconfig.1273: removeFile: failed (Bad file descriptor)

I've been searching and searching for where either tool tries to delete 
anything, but can't find a thing.

Any help much appreciated.

Thanks

Bob