If we knew what device you had we could tell you how to do a partition cache wipe, as belodion suggested. I don't want to say typically, but typically with bugs after a major OS update there are two fixes. Partition cache wipe and factory reset. Obviously we'd want you to try the less painful one first, which is the cache wipe.
I've recently seen a similar complaint so there may actually be something up with the flashlight thing but try the cache wipe and let us know what your results are.
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