And I had Application Enhancer, Shapeshifter with ClearDock and several other Unsanity products installed on my machine and while they did not function after a Simple Upgrade, I also had no bluescreen issues during the installation.
Now, I did go through and turn off all the apps I had loading at startup, including Shapeshifter, SuperDuper, Logitech Control Center and and several others. The same advice about removing peripherals during OS upgrades also applies to turning off these types of items - In Windows, this would also include Anti-virus software, Spybot's Teatimer and like programs.
And just because a particular issue has been discovered, does not mean that this is the sole issue causing a similar problem across the board, especially when it comes to OS installations. Don't care which OS it is.