Particularly I'm noticing the issue with my Google Chrome icon the most.
I have most of my shortcuts as icons in the taskbar. I have my "taskbar buttons" options set at "Combine when full", which I really like. It'll turn the icon into a stretched out, highlighted, taskbar rectangle when the application is running... but for some reason, google chrome will sometimes just create the application task without combining onto the shortcut I just used to run the app. When this happens, it keeps re-happening and clicking the shortcut again won't switch to some magic window, it'll just keep creating new windows.
I'm not sure if a reboot would solve the issue, but for now, I find if I just recreate the shortcut, it fixes it until the next time the problem starts reappearing.
It's mostly just a cosmetic issue, but my OCD is quite annoyed by it. I haven't noticed this happening with any other applications yet besides google chrome....... but I'm sure given the right set of circumstances, other apps could do it too. Autocad, IE, my Microsoft Office products, VLC, and some other stuff, all combine with the shortcut 100% of the time as they should. Anybody got any ideas?