Is there a bug that i'm not aware of here? Or an I missing something here.
AeroScenery can call GeoConvert in two ways: the default, which opens up the same number of GeoConvert windows as the number of tiles you have selected, or with the wrapper where I (attempt to) open and close GeoConvert windows sequentially.
You can change that preference in Settings > GeoConvert
If you didn't have it selected, you must have inadvertently selected several tiles. It's easy to do as they are selected with one click. The status bar at the bottom will show how many you have selected.
Opening several GeoConvert processes will usually cause all of them to lock up, so I warn against this in AeroScenery.
If you had it selected, the process I use to figure out if GeoConvert is done and kill the task hasn't worked. This is entirely possible, as I'm having to screenshot the GeoConvert window every second and scan for green text. GeoConvert (particularly the newest version I find) often fails to report it's done when it's done and just hangs, making this process fail.
The fragility in the process would be avoided if GeoConvert was a normal console app that exited when it was done.