If the rose product has fertilizer, I would have to agree that it is fertilizer burn. Rose fertilizer is very strong and can kill plants that are sensitive to fertilizer. I would flush the medium really good to get rid of any residual fertilizer. If it loses all of its leaves, don't worry too much as cyncnodes tend to put up a second flush of growths.
You could always sprinkle the medium with Osmocote when it recovers. Good Luck!
---------- Post added at 01:35 PM ---------- Previous post was at 01:32 PM ----------
If it is just from the sun and has stabilized, then you won't have to worry about anything more. I was concerned because I grow some plants that are sensitive to fertilizer. I've always stayed away from the stronger stuff with the orchids.
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