[narwan]

I was finaly able to reproduce it!
Open game (A0 automatically selected at start); press L; press L again. A0 won't load.
Change to unit E2; press L; press L again; E2 will load into E4.
Same if you click on the button on the right side twice. The A0 will load if you use the mouse to click on the HT after the first L command instead of giving a second L command.

Narwan