I too am interested in opinions. I am seeing the same spots on just one leaf of just one plant.

Mine is indoors in a big container in front of a big window.

NorthwestPlanter(4a), Is your plant indoors or out? In a container?

Its indoors, in SE facing sliding glass door. It gets about 4-5 hours of pretty direct sun right at the minute. I use a humidifier and keep it moist all the time. I think I might have had it too wet earlier last month (constantly wet for about three weeks) which could be causing this leaf spotting/browning. what do you think?

I bumped a poorly edited thread I started over on the container forum. It might be interesting to check in on that one from time to time.

Over watering hypothetical: over watereing a Colocasia - In a container, how would one know if one's Colocasia, giant Borneo, or some such I think, is being over watered?