Just execute "ResetMlint", and it will delete the file "MlintFailureFiles" , which contains all file-names for which Matlab temporary disabled m-lint, causing M-lint and cell-mode to work again for those files.
M-lint caused your previous MATLAB session to terminate unexpectedly. Please send this message and file name
to MathWorks. See "About M-lint and Unexpected MATLAB Termination" in the MATLAB documentation for details.