Created attachment 1572 [details]
R and Obj-C error messages.
See the attached file for full details. I clicked on an editor window to add a new line and code and received the error. The remainder of the editor window when blank, and after typing cmd-Z to undo the new-line I had entered the text returned. I saved my work, but was unable to continue editing in that editor window for the remainder of the session. The problem reoccurred while scrolling through another editor window in the same session.
Received this additional message when trying to quit R using quit():
2014-02-25 12:40:44.058 R[26390:707] *** run_REngineRmainloop: exception -[RScriptEditorLayoutManager _fillLayoutHoleForCharacterRange:desiredNumberOfLines:isSoft:] *** attempted layout while textStorage is editing. It is not valid to cause the layoutManager to do layout while the textStorage is editing (ie the textStorage has been sent a beginEditing message without a matching endEditing.) caught during REPL iteration. Update to the latest GUI version and consider reporting this properly (see FAQ) if it persists and is not known.
Consider saving your work soon in case this develops into a problem.