Well, LV 7.1 BTW...
The VI runs when it is opened. Scrollbars are not visible. I could resize the window to expand on the bottom but not on the top (trying to resize using the upper corners/window border had the same effect as doing so on the bottom). The run/abort buttons are not visible. My control abort button was above what I could see on the display. I could not switch to the block diagram because the VI was running.
I ended up moving the VI to a directory of its own so the sub-vis could not be loaded; the VI wasn't able to execute when opened (phew). I thought there would be a keystroke (I think I tried every ctrl/shift/alt/break/esc combination) to abort execution. If I didn't have sub-vis in there I'm not sure what I would have done!