My first thought was also oedema. I'm no Catasetinae expert (have had only one, for a couple years), but I've seen oedema on mine. I guess it shouldn't be surprising seeing how much water these plants are given.
Oedema happens when the plant is taking up water faster than it is being transpired by the leaves, causing higher water pressure in the leaves, which causes cells in the inner leaf layers to burst. Usually it's caused by a combination of saturated medium and conditions not conducive for sufficient evaporation (high humidity, cool temps, cloudy weather)
I would not worry too much about it, as there is little that can be done to prevent it unless you have complete control over your climate, and you don't want to reduce watering of these plants in the growing season...
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Camille
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