Yesterday everything worked fine, I installed the updated plugin with imporved FSC and it worked great.
Today, not so much ;). When I try to run anything with or without FSC, I get: scala.tools.nsc.MissingRequirementError: object scala not found. Moreover, some random types are not "seen" by the editor, e.g. Option and Seq (they are highighted as red and auto-import suggest some Option from java). However, I can open Option by using "go to class". I tried recreating the project (using SBT), removing all the caches, removing the plugin and installing it again, but nothing helps.
Any suggestions? :)