I'm trying to play Runescape for the first time but I cannot even login. The game loads, but then all I see is a black screen and the cursor. There's also music playing in the background, but I can't see anything apart from the cursor. I'm trying to play in a Mac with Mojave 10.14 and I play OSRS just fine. Is there any way to resolve this issue? I've looked on the support page, but can't find anything.