I just came to say that the game kinda crashes when i try to save any settings... and by "kinda" i mean it locks up for a while, i get some exceptions in the console and then resumes, but any change doesnt get saved after quitting the game...
I noticed that you just said that you fixed the same issue, but for me it doesnt seem to work.. maybe an incopatibility with another mod ? I actually kinda have a suspect, mainly auto ste pup mod. Why ? Because i also had this mod in mc 1.9 and something similar happneed (settings nto saving) but without the apparent crash.
Below is the error log.
EDIT: well, it seems that my log was too long, here.
I can't help but notice the flood of
[Client thread/WARN]: Failed reading metadata of: http://www:http://i.imgur.com/MfRhezf.png com.google.gson.JsonSyntaxException: com.google.gson.stream.MalformedJsonException: Use JsonReader.setLenient(true) to accept malformed JSON at line 2 column 2
Ill have to add/remove mods to see what's causing this... aaand its from the excore mod. Ignore it. Filed a bug report to the author.