A php script launched in cron on lpcp failed, whereas the same script works ok on a cpanel account (I have both).  Because of compile errors not showing on lpcp setup it was failing with white screen of death which produced no results - i.e. it looked as though the cron wasnt running.  Lp support hung in there with me on this for a couple of weeks (!).  But they were very focussed on "our stuff working brill - must be your stuff going wrong".  This encouragement did keep me on the debugging trail.  I'm pretty sure the prob is that the $_SERVER variables output /usage whatever is different on lpcp cron.  I didnt actually get to the bottom of the issue.  I just got cron to run the script with curl instead of php and it works ok.