This thread is at least 2 months old, but I would like to throw my 2 cents in here if I could.
My Masdevallia house is in the mid to upper 40's at night in the Winter months and 50's during the day. This is not a problem for them, but the amount of light in Oregon is. The spots happen when the plants are too damp and a lack of air movement around them. Be careful watering your coccinea in the Winter, this is one species that can be over-watered easily. During the Winter months I usually let them go until they are almost completely dry before watering them again. The humidity is so high here they aren't going to dehydrate. It sounds like the OP has similar conditions. Also the cool damp conditions in the winter are perfect for molds, fungus and bacteria to flourish. Moving the air makes an amazing difference for these plants. Finally, don't overcrowd these plants, the lack of air circulation between plants is problematic.
That is all, thanks!
Liana
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