Problems setting path in r2017b on MacOS Sierra

I just updated to r2017b. I'm adding the work directory and its sub-directories to my path and start a script. It crashes saying the file specified in the path doesn't exist. Yet it does and the whole tree is in my path. I revert back to r2017a and everything works fine. I have also noticed that double clicking on the path in MacOS Sierra (v 10.12.6) (even with r2017a) is not responsive and requires specifically the designation of the path with "add path" or "open". Any suggestions? As it stands now, I can't get any work done with r2017b.