Can you post some pictures and describe how you're caring for them (light, watering, fertilizer, etc)? In the absence of any other info, watering issues are probably the most common problems so I'd guess maybe they're getting watered too much or something along those lines, but some pictures and better description of their living arrangements would help.
Sure - actually they're just frozen in time. I brought them in from outdoors this week. I did notice some wilt and a couple of yellow leaves but that was from lack of water this time.
I don't suppose I'm caring for them much at all right now. I transplanted them into some I think MG potting mix this summer. One is in a 2" sq. pot and the other in a 4" sq. plastic pot. Both have small healthy green foliage, but they are not growing at all. They're not growing, but they're not dying either. Maybe some plant food. I also have some super thrive that I could mix in.
So what I'm saying is that I've sort of tried EVERYTHING since the plant was given to me in early spring/late winter. I am actually pleased that they are still alive.
I just read that they want heat and humidity. If that's true I can put them in my green iguana's room which stays 70-80 deg in winter and 45%+ humidity.
So thoughts on someone else's ideal growing conditions, if you have them, are what I would like to hear about.