I couldn't pin down the precise reason for this error on my wife's S5, but the greyed out stickers appears to be affecting random stickers in each set, never all of the same set, and the affected stickers are always failing to showing/a repeatable failure. I solved it, at least in the short term, by deleting the cache for FB Messenger via the App Manager. It'll be a while before I can declare the permanance of this solution, but you can probably consider it either a permanent or quick solution to the problem if I don't post about it again.
On a side note, I noticed wifey's practically installed all the free sticker sets so that may have been a factor in the occurence of the bug and may appear again after she installs a certain number of stickers/sets.
02-08-2016 07:05 AM