Steam games on my Mac have stopped working
Only recently, and I'm not sure why (could possibly be Steam updated) my computer can no longer run any Steam games. My computer is an old Mac Pro running on Yosemite, but even being so old it should be okay to run this stuff. The error message I get is -
Dyld Error Message:
can't resolve symbol _MTLCreateSystemDefaultDevice in /Users/admin/Library/Application Support/Steam/Steam.AppBundle/Steam/Contents/MacOS/gameoverlayrenderer.dylib because dependent dylib #6 could not be loaded
I'm not great with computers and have looked in that folder and everything is still there, so I'm pretty stuck on what to do.
Mac Pro, OS X Yosemite (10.10.5)