PowerConnect 5524 with 3rd Party Optics

We are using Champion One 10KM and 40KM BIDI (single fiber) 10GB optics (10GSFP+) in  Dell Powerconnect 5524
Switches (firmware 4.1.0.10). We are running the switches in stacked pairs with
an optic in each switch (using Link Aggregation).  The switch pairs are
communication fine until we need to reboot or lose power.  After power is
restored, we have no communications through the optics.  However,
communications are restored when we disconnect and reconnect the fiber patch
cords.  Has anybody come across this type of behavior?

Thanks

Brian