Occasionally Schedule XP can get corrupted. Corruption is the reason Schedule XP is broken up in 2 parts...the front end and the back end. The back end holds the data while the front end is the interface you interact with. If Schedule XP isn't starting up correctly try the following.
1. Restart you computer
2. Re-install the front end by downloading and installing the latest patch from
www.worldpt.com\downloads.