The problem is that certain key presses activated by MacroMagic (two are "Alt+d+s" and "Alt+t+m") open other application windows (Windows Media Player and Firefox, respectively) disrupting the running macro. If I press these by hand (either sequentially or all together) while in the lab program, nothing happens.
I've been scouring the web for where I might find keyboard shortcuts that could explain this, but have had no luck.