I've developed several small experimental apps this week, loving B4A with every step. However, yesterday some probably related symptoms showed up and I'm stuck. The Debug menu item is always grayed out, and my apps now refuse to run on my smartphone in Debug mode. I created a very simple app, just a Msgbox() in Activity_Create, with the same results. My apps install and run fine when in Release mode, but in Debug mode they appear to compile, install, and then nothing happens. How do I re-enabled my Debug menu item? I watch carefully, and it never goes black, just stays gray, no matter what I'm doing. Is this a known issue? Did I clobber something? Is there a Registry setting to clean up? Is there a simple fix for me to try? I ask about the Registry because when I start a completely fresh run of B4A after rebooting my computer, even the simplest of apps that always worked in Debug mode before now refuses to work. So it seems something external to B4A, such as a Registry setting perhaps... Win 10, B4A 5.50, registered version.