Can't Exit Design Mode vv_select_Date

I really really need help on this. Can anyone please let me know what you think

i have a VBA code with several pages , buttons etc.. it works perfectly fine on most computers. On my boss's computer when he opens and saves it then next time someone opens it it gives error

Can't Exit Design Mode vv_select_Date , blablah ,now when i save on top this error, and exit next time it works , so my boss's excel when he saves it this happens , we all have 2010, and even we asked IT to reistall excel for him, still same problem , can anyone help please ?


vv_select_Date is a drop down date selector in the excel , we cant understand why its not working for him. Someone help please

Thanks
Arbi