id	summary	reporter	owner	description	type	status	priority	milestone	component	version	severity	resolution	keywords	cc
10200	Cron not running	firmdot		"Since upgrading to 2.7 and now 2.8 we're unable to schedule posts. The error is missed schedule.

There are a number of people having this issue too, check page 3 for the most recent reports:

http://wordpress.org/support/topic/221086/page/3
"	defect (bug)	closed	normal		Cron	2.8	normal	wontfix	cron, schedule	tflight