I have a network of several sites set up as sub-blogs on a WP Multisite install. On the main site, I use WpeMatico to fetch and post content from the sub-sites rss feeds, so its front page always shows the newest content in network.
After last update of W3, WpeMaticos scheduled cronjobs stopped running. Yesterday I tried deactivating W3 Total Cache, and imediately cronjobs started running as normal. Then I reactivated W3, and as expected, crons stopped being triggered again.
So, either something had been done to W3 in last update that clashed with WpeMatico, OR, there is some cache setting I have not been able to figure out that affects wp-cron.