Windows 7 hangs at shutdown with 12.1.5

Hello All,

Over the past week I have recently started to slow deploy 12.1.5337.5000 client to several Windows 7 machines, thought it was going fine, but now getting reports that when machines are just hanging at shutdown screen.  I have uninstalled 12.1.5 and installed 12.1.4112 and it is now working fine.  32bit and 64bit the same.  To remove have to use the CleanWipe tool from Symantec.

Is anyone else having this issue?  Thoughts / Fixes?

Thanks in Advance