Temporary fix - went into Windows 7 control panel and disabled mouse wheel button function. I can now use the F key to swap weapons and random swaps have ceased. I am still having issues with the RMB functions though. Have mapped Hold Breath to the left shift key, but seems I need to remap the zoom function as well.
Yes, the RMB functions are now behaving erratically. This is SO frustrating. I am using well recognised kit sold by Microsoft for goodness sake!
This is a War simulator... and the control interface for your weapons don't work????
OMG!!!!