I've been using WPFMP on more than 25 WP installations for the past several months. It has been working great on all of the sites, even sites with infrequent visits.
Now, on one of my sites, it no longer seems to complete the automatic scans. All of my sites are on the same server, and have many of the same plugins. The site where it stopped working is the most elaborate and has the most plugins.
I have the WPFMP plugin set to an hourly interval using the WP cron, and the site gets enough traffic that it should trigger the scan. When I visit the plugin settings page, I can see that the reported "Last Scanned" time is always within the last hour. But, it seems to me that the scan is not really completed, since I am not getting an email from the plugin. I know for sure that files have changed on the server between scan intervals, since I added/deleted files as tests, and the server error logs usually get updated/changed every so often, too.
If I activate a manual scan, it works perfectly and reports the changes in the tests I've made.
If I change the settings to use "other cron" and use the special URL with the "sc_wpfmp_key" in a browser, it runs the scan as expected.
I have checked the WP cron events/hooks with another plugin, and the "sc_wpfmp_scan " hook is scheduled to run hourly.
I have a good number of plugins on this particular site and I have disabled/enabled and tested all of them as best I can for compatibility. I'll keep plugging away at this and see what I can find...
This issue first came to my attention shortly after updating to WP 3.7.1 from 3.7 - just a coincidence??
Are there any known conflicts with other plugins or server settings?