I hope this helps some others that have had the same problem I and quite a few others have had with the thumbnailer. The one listed in the Readme file -
http://www.m-software.de/screenshot/Screenshot.png?url= has never worked for me, it may or may not work for you; however, I have gotten these to work on ver3.6.8 PL2
http://www.artviper.net/screenshots/screener.php?&url=
http://open.thumbshots.org/image.pxf?url=
http://livethumb.de/?url=
http://image.picoshot.com/thumbnail.php?url=