I'm on the most recent version of both WordPress and Super Cache, and everything is working great except that preloading the cache ONLY works for our main site and not our other WordPress sites in a single multisite setup.
There are around 300 pages on http://example.com and they are all preloaded just fine, but example.com/site2, example.com/site3, and example.com/site4 are not preloaded by hitting the "preload now" button.
The other sites ARE cached after someone visits them, however. It's only preloading that doesn't work.
Any idea what might be the problem?