My setup is a DSLR with a MPCC and a light pollution filter. When I looked inside at around 7:15am, the secondary was fogged, it looked like the primary may have had a bit and the guide camera was really bad. I didn't notice anything on the light pollution filter though.
I do have heaters on the guide camera and the secondary (newly installed last night), but I'd set it quite low with my homemade controller (a cheap PWM dimmer from Ebay). I'm being cautious because I don't want to set up tube currents. Probably should have left my homemade dew cap on though. Oh well, live and learn.
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