This might be a general windows question, but it is happening when i
have a spreadsheet open in excel (no script editing window open):

Screensaver comes on as usual, then I wake the machine, instead of
just seeing my spreadsheet, i see the visual basic window. When I
close the VB window, i'm back in business.

it's a bit of a nuisance, and i'm concerned about sharing the sheet
with people who have never seen VBscript.

Has anyone seen this before? any ideas on what's causing it?