To be precise: Texniscope currently does not pdfsync if the filenames have spaces. I've contacted the developer of Texniscope and brought this to his attention, and he fixed this and the next version of Texniscope will be working fine with spaces. Not sure when that next version will be though.
There will be a next version of TeXniscope? Cool, I already thought development was gone there… the version I could find was ages old. I am lucky it runs in Carbon/Rosetta… ;)
Does it work if Spaces are escaped or encoded?
Dan