Am Mon, 09 Nov 2009 22:22:17 -0500 schrieb Barry Watzman:

pair of identical modules). Verify the configuration with the manual,
or TRY swapping two modules of different types.
I've now swapped the modules. Now the pairs do not match in types but it
seems to work better and without any problems so far.

Thanks for this tip!

--
cu
Michael