Same problem here... not only with SH IV, with SH III and IL2 saga... next time buy an nVidia instead this @##$$ ATI, this happens disregarding the drivers version i switch....
But... i note it happens to me into SH IV, only after patch V1.2.... not before, may be related to the AA and AF capabilities added by this patch ?
The solution i found was to UNDERCLOCK the ATI card core and memory...
Signed : Another unfortunated ATI user... :rotfl: (X800 XT PE)
