Hi, Yergz,
I believe all of us, whether using single or multiple displays, have our own reasons for desiring a defect-free operating system for our personal computers.
For the record, I did follow as many of the tips I ran across in the contributions from others as possible, before applying the Cumulative Update Preview update. In particular, I believe I turned off all Notifications, although I'm no longer interested in bandaids for this issue.
Also, for the record, the "you can only have one taskbar on this side" did come back once -- but only once time -- since I applied the Preview update.
Finally, it seemed that I needed to have the PC timeout for going to sleep be equal to the display timeout for turning off. Again, why this may be so, is no longer of interest.
I guess what I'm trying to say is that I'm ready for a defect-free PC OS. I say this as a successful software engineer (my fortes were debugging and graphic design and database access methods) and a holder of a Master's degree in Computer Science and Software Engineering.
So far, I don't fault the hardware or firmware. It's the OS itself...
--Dennis