I've just finished installing Manjaro completely from a fresh install, on a brand new hard drive entirely following the default install procedures. I've carried out no console commands at all, simply installed some standard software (all with several hundred, if not thousand users) and all from the package manager. Beyond that (and changing the look and feel of the desktop) I've done nothing else.
I've rebooted several time successfully during this process.
I just booted Windows (on the other hard drive) to do some work, restarted and now Manjaro does not appear on my boot menu (just the name of the hard drive it's on. When I boot to that hard drive the machine just reverts to Windows as if there were no bootable media.
I know you must hear this all the time from relatively new users, but I'm almost certain I haven't done anything to this set up that isn't completely normal use. And It was working fine prior to this (including shutting down and restarting).
If there's something wrong that I'm not aware of, I'd be grateful for any assistance. If not then I guess I need to know how one goes about reporting a bug.