Masdevallia black widow - what am i doing wrong??

[jstern]

Hi,

I bought a Masdevallia Black widow (ayabacana X cucculata) about 2 months ago and since I brought it home it's been doing great. It had a small growing leaf on it when I bought it and it continued to grow healthily until about 5 days ago. The new growth quickly became yellow and dropped today.

I've been reading on this forum and elsewhere about care conditions and am providing it with moderate - bright (but not direct) light, plenty of humidity and am keeping it moist. What's wrong?! I really want to succeed with this one as I imagine the flowers are beautiful.

Can anyone provide any tips?

thanks!