Game was unable to locate a file, and uninstalled the "orphaned" version of 1.9 as a result. I was able to play Minecraft in 1.9 yesterday without issue. This log includes a reference to report this issue to this website at "[11:00:24 FATAL]"

Attached is the full launcher log. The Game Output read: Error: Could not find or load main class net.minecraft.client.main.Main
Java HotSpot(TM) 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release