Action on button click not working

[#1]

I have a very simple button in my app, designed to opena different sheet when the user clicks on it.  See the attached screen shot.  (Yes, I verified the sheet number!)

There are several similar buttons, and none of them work.  They were working previously, but now they isn't.  I probably turned something off accidentally in the Document or Sheet Properties.  Can someone point me in the right direction, please?

[#2 · Accepted solution]

Never mind.  I figured out that the "Read Only" button was checked in Sheet Properties.  Unckecking it solved the problem.