I have the same problem started yesterday D: I thought it was ROBLOX updating so I left it a day but I tried again and it said ROBLOXApp [15] not working or something...
I can go on the game now but when I press Game settings to open studio mode in Build mode it doesn't say studio mode?! Is this some kind of new update?!
umm can u guys help me, because wen i use build mode i just get an empty sky and i cant do anything... + i cant use studio mode because theres something wrong with the java script.. plz help me