Latest patch killed my game and the patcher in it would not run anymore.. So I am in the process of reinstalling and I found a horrid user interface bug, of sorts.
The installer is not running as an application. It is running as a process... It means that if minimized it is not visible on the task bar, you cannot alt-tab back to it and it cannot be pulled back to foreground by the task manager... It just hides itself and runs in the background.
UPDATE: It's the installation downloader that did it and not the actual installer, and there is a chance this might have been a fluke specific to my system, but I did minimize and couldn't bring it back to the foreground by any means I tried, so killed it and started over.