Are these problematic adverts?

At this site http://www.weegclub.nl/forum/smeer-leverworst-t27194.html
I found a couple of subSilver/images/spacer.gif
webbugs flagged as green red-rimmed squares.
My Web bug detector extension in the Google Chrome browser detects them, see: http://static1.weegclub.com/forum/templates/subSilver/images/spacer.gif
Backdoor scripts can be uploaded to abuse these image directories.
The ones here seem clean, but webbugs often go under the radar,

polonus