Missing click

Using Arduino ProMicro some clicks from the push button were not detected. This solved the problem in the example :
...
ClickEncoder::Button b = encoder->getButton();
delayMicroseconds(5); // added small delay to avoid missing click
if (b != ClickEncoder::Open) {
...

[soligen2010]

Just FYI, My fork of this library has a number of bug fixes and enhancements. I had this experience too and fixed it, but it was a different fix than what you have. Perhaps it is the same issue or perhaps not. If you like, you can try my fork and see if it works for you.