upon opening the world I got the following message:

[08:38:33] [Client thread/INFO]: [CHAT] Unable to locate sign at 11, 79, 1
[08:38:33] [Client thread/INFO]: [CHAT] Unable to locate sign at 4, 78, 1
[08:38:33] [Client thread/INFO]: [CHAT] Unable to locate sign at 11, 78, 1

if given time the signs will load with the original text, but for atleast the first ten minutes of opening my single player offline world the signs listed will be missing, before appearing blank, then finally showing the text. the signs were placed when the world was on snapshot 15w35b. does not affect all signs oddly enough, only those three out of 7. If i am not mistaken however they are just over the edge of a chunk border next to the world spawn chunk. not sure what other details to include.

(tried searching the forum, saw several other sign bugs, but wasn't sure if any of them were directly tied to this bug)