Failure to "open" an m-file in the editor

Clicking on a file in the "current folder" window, or saying "open(file.m)" no longer opens file in editor. This worked up until last week. I am running Matlab R2014b, on a Mac with OSX 10.9.5.

Answer 1

[Philip Caplan]

Lance - please try regenerating the MATLAB preferences for R2014b as described in the following link:

http://www.mathworks.com/matlabcentral/answers/99625-how-do-i-regenerate-my-matlab-preferences

[Lance Optican]

Remaking the prefs directory failed to fix problem.

[Liqiang Zhang]

cannot fix the problem on Matlab R2019b

Answer 2

[Jan]

Restore the Matlab folder from your backup, such that you have the same conditions as last week.

Please explain, what happens if you try to open the file. Do you get an error message?