Jail Break for iPhone 4 erased my calendars

[pmorin1338]

I installed the Jail Break on my iPhone 4 and installed various apps from the Cydia Store and mid day my calendar stopped working that was synched with an Exchange account and Mobile Me. The Exchange account will sync email with these accounts but not calendars. Additionally, when I go into the calendar app nothing is there and when I try to add an event it wont let me. I know there are a lot of kinks right now, does anyone know what to do. Please advise