This is FYI as all seems to be fine now.

I have been having problems with iFolder 1.03 on NW6SP4 not loading and
giving the error described here
Creating and using a new certificate would sometimes work on the first
reboot but never on subsequent reboots (This is a test machine and is not
on 24/7).

This problem started around the same time as I setup DHCP on this server so
I moved the line that loads DHCP to the end of the autoexec.ncf and
introduced a 30 second delay just before it.

iFolder now loads every time.

If anybody has an explanation I'll be glad to hear it.