Problem in check box cce with file widget

Hello all:

 I faced a problem when trying to place 2 file widgets and check box cce in the same content component, when I check the check box then load a file the component page refresh and the value of check box cleared.

I tried to use check box only instead of chack box cce it didn't work at all when I click ok and edit the component again I found the value is cleared.

have anyone faced with such problem before or could have reasonable explanation for what's going on.

Note: I use cif for the component and I use the following tag in order to apply the second file widget validation for extensions <cma:syncsession/> would this cause any problem?

 Thanks in advance