Calender Entries Keep disappearing

Hi. I have a user who when ever he enters entries in his Calender and goes back to veiw them, the entries are missing!. If he sets an alarm for the calender he gets the notifications even though he cannot see the entry in his calender view. Has anyone ever seen this or know how to solve this problem? Any help would be greatly appreciated.

Subject: Calender Entries Keep disappearing

have u tried to update/replace the design?