Using 4.0.6 (also upgraded to 4.1.0 same result) on win7sp1/64bit, all is OK, however, during logon, right before the desktop is ready for use, the start menu jumps and shuts jumps and shuts about 5 to 6 times, then ends up closed. This is visually disturbing

Also, as a result, the taskbar rearranges itself, and all the taskbars get mixed up, language bar, icons move around. The only w/a for that is "lock taskbar", but still the jumping start menu is happening.
How does one go about debugging this?
In the startup (msconfig), there are about 5 programs listed, and over all total of 50 processes once the laptop is fully running, so it's not loaded with bunch of software, very light.
Any tips welcomed!