Black spotting on this type of orchid is very common - I wouldn't worry about it. The typical progression is that each season new bulbs are produced - THOSE are the ones that produce flower spikes. Once they have spiked they will provide energy through their leaves for the next generation to repeat the process. Eventually in a couple years the leaves will yellow and fall off and you will be left with only the pseudobulbs. So, with 3-4 years growth you might have a bare pseudobulb or two, a couple of yellowing leaves, lots of good healthy leaves, a few bulbs with spikes (and after flowering new growth starting). If you have a digital camera you might post a pic of what the spots look like - but I'm guessing it is nothing serious. mike