I have always used a standard two button mouse on all my Mac computers.... so I can use a true right click as opposed to Ctrl-Left Click
Recently.... Right-Click doesn't "stick".. .meaning I right-click and a context menu appears, and then disappears as soon as I release the button, instead of staying until I make a choice or dismiss it. If I use Ctrl-LeftClick all works fine.
This has just recently become a problem.... has any one else experinced this.... its not just in Xojo
macOS Mojave 10.14.3