Problem: 2.9.1 Schedule Posts "missed"
Domain on godaddy w/ nameservers going to DreamHost.com
Added this to the to defines in wp-config.php file:
Fixed my issue.
I believe it was a DNS issue as mention in the linked post.
I tested on another install of WP 2.9.1 with the domain registered with DreamHost and the Schedule Posts work just fine, no issues.