The Lighting Controller

After i upgraded, activate a scene button in Live, Turn on 3Dview CPU spikes up to 100%. If I close 3Dview, CPU goes down to about 75% and if I quite Sweetlight all together it goes down to about 50%, leaving a "svchost.exe" running at 50% CPU usage and 120K-121K memory usage.
If I kill that, CPU drops down to 17-18% idle (normal).
If I then start up Sweetlight, it's still 17-18% idle.
If I start the same Scene, 17-18%

Windows 7 - 32bit
Sweetlight 7.1.79 zip updated from 7.1.74

Ok, after an reinstall of software (7.1.74), then patching it (before using it) to 7.1.79 solved the problem.