When trying to rename

class Bug {
  def f = {
    val tryRenameMeInMethod = 0
    println(tryRenameMeInMethod)
  }
}

tryRenameMe in the code above, I get

Caused by: java.lang.AssertionError: assertion failed: Race condition detected: You are running a presentation compiler method outside the PC thread.[phase: <no phase>] Please file a ticket with the current stack trace at https://www.assembla.com/spaces/scala-ide/support/tickets
	at scala.tools.nsc.interactive.Global.assertCorrectThread(Global.scala:535)
	at scala.reflect.internal.Symbols$Symbol.rawInfo(Symbols.scala:1565)
	at scala.reflect.internal.Symbols$Symbol.info(Symbols.scala:1499)
	at scala.reflect.internal.Types$TypeRef.decls(Types.scala:2219)
	at scala.reflect.internal.Types$NullaryMethodType.decls(Types.scala:2468)
	at scala.reflect.internal.Types$Type.findDecl(Types.scala:971)
	at scala.reflect.internal.Types$Type.decl(Types.scala:566)
	at scala.reflect.internal.Symbols$Symbol.getterIn(Symbols.scala:2402)
	at scala.reflect.internal.Symbols$Symbol.getter(Symbols.scala:2398)
	at scala.tools.refactoring.implementations.Rename.getter$1(Rename.scala:32)
        [...]
	at org.scalaide.util.eclipse.EditorUtils$.withCurrentEditor(EditorUtils.scala:161)
	at org.scalaide.util.eclipse.EditorUtils$.withScalaFileAndSelection(EditorUtils.scala:181)
	at org.scalaide.refactoring.internal.rename.Rename.isLocalRename(Rename.scala:39)
	at org.scalaide.refactoring.internal.rename.Rename.getRenameRefactoring(Rename.scala:31)
	at org.scalaide.refactoring.internal.rename.Rename.perform(Rename.scala:27)
	at org.scalaide.refactoring.internal.RefactoringHandler$class.execute(RefactoringHandler.scala:13)
	at org.scalaide.refactoring.internal.rename.Rename.execute(Rename.scala:24)
	at org.eclipse.ui.internal.handlers.HandlerProxy.execute(HandlerProxy.java:294)
	at org.eclipse.ui.internal.handlers.E4HandlerProxy.execute(E4HandlerProxy.java:90)
        [...]

most of the time, but not always. Note that I'm having this issue on box with 4 cores and 8 hardware threads.