RSS Poster Robot.....still not working

[JohnnieOO]

Hey gurus,
I have a new 4.2.1 install. One of my first tasks was to add RSS feeds through the RSS poster robot. The feeds are actually updated every few minutes and I have the RSS Poster Robot instructed to check the feeds every 20 mins (30 mins on some). At best, the feeds are checked by the robot once per day (though some days they don't check).
The feeds do update anytime the "run scheduled task now". BTW, I installed some of the RSS feeds in RSS Poster Robot on a 3.8.7 forum on same server, the feeds updated normally.

There are no errors logged on the server and there are no known errors in the scheduled task log (not sure what they would look like). I have uninstalled VBulletin and re-installed, recreated the RSS feeds and still no updates. As best as I can tell, the RSS poster robot is not checking the feeds, period.

Any suggestions? Is there a way to force the RSS check with Cron? Never messed with Cron Jobs but some of my research is pointing me there, I just don't know how to go about that.

Thanks,
Johnnie