my system specs:
GPU: ATI HD4870 1GB
CPU: AMD Phenom II X4 955 3200
RAM: 8 GB
OS: Windows 7 Professional x64

3DGS: A7 Commercial 7.82.3

I have neither problems with SED nor with WED.
But I only tested with no significant background tasks and Firefox as background task.
No errors in both cases. I also started it multiple times.
I might try again.