Ok got the resolution to this issue.. it was down to the fileterdrives value set in the registry..
Resolution: By default, the MaxNumFilters value is 8. You can change it up to 14 using regedit in this location:
Note: If you don't see MaxNumFilters name, you can create it. the Type is REG_DWORD as shown below.
Remember if you are going to make any changes to the registry back it up first