Apple - Custom keyboard layout problem High Sierra

Some things to try based on others who have had this kind of problem with other keyboards

• Make sure you do not have Siri turned on and that its keyboard shortcut is set to none.

• If your layout is in Home/Library, try Library instead. And vice versa, and try it in both at same time.

• Disable any antivirus apps

• Safe Boot

• Set up new user account and see if it works when logged into that