With the latest patch version 363, if you have a unit selected to build, but haven't placed it yet and if you hit the SHIFT key (the new multi-select) and release the SHIFT key, the game doesn't return to the "CANCEL" button does not reappear. Not a big deal, since you can hit escape to cancel the build, or re-click the unit in the build menu to get the cancel button to re-appear. It probably shouldn't pop up the "MULTI_SELECT" window if you are in build mode. Just a minor annoyance.
Thanks.
Nice catch. :)
Just checked and I can confirm this.