I'm hitting the same bug.
For more information, I'm using the trick given in mplayer's man page to
prevent xscreensaver to run while watching a movie:
mplayer -heartbeat-cmd "xscreensaver-command -deactivate" file
When playing a movie, I see the following message repeated regularly (I imagine
every 10 minutes, since it's the delay for the heartbeat, by I've not verified
xscreensaver-command: not active: idle timer reset.
Might be the same problem as:
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xscreensaver does not respect disable screensaver suppression of
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