Die-off of active new roots in S/H

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Hi,

I have quite a few plants in S/H and things had been going well for weeks, but now I see that some of my S/H repotted plants may be starting to fail. The roots that were growing so well have died, blackened, and are starting to slime. A few of my Bulbophyllums look to be the hardest hit (particularly a Bulb ramosii and a Bulb liliacinium). The ramosii still has older roots that are green and viable, but the new roots that were actively growing have been lost.

Could this be from an overdose of fertilizer? superthrive? K-L-N? I feel like I saw this problem after misting on superthrive... Is overdose or burn a common problem in S/H?

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