Problem: Programming the CPLD had earlier worked using Diamond 3.10.0.111.2 but failed later with the 3.144.3 service pack version giving an error "CHECK_SECURITY_PROTECT_KEY".
I had also updated the generic FTDI drivers to the latest ones from FTDI's homepage, as the Lattice installation apparently broke other FTDI code on the same machine by reverting to older FTDI drivers.
Solution: Reinstalling the original Diamond version and reinstalling its USB drivers (dialog during install) solved the issue, on Windows 8.
Hi,
we didn't tried out newest service pack until now.
Thanks to share this information and possible solution.
br
John