If you have long file names, longer than can be displayed in the file list layout, and you hover the mouse over that name, the system will display the full filename in a tool tip sort of mode.
While this "column expansion" mode (or tool tip, if that is more accurate) is active, you cannot use the keyboard shortcuts -- such as Ctrl-G, Ctrl-O and so forth.
If you move the mouse away from the long filename, once the tool tip disappears then keyboard response is restored.
What version (build date) are you using? This was fixed some time ago, and is fixed in the final 2.3 -- now, when Ctrl is pressed, the tooltip goes away.
Nope, doesn't work here. Not sure why, but the tooltip does not go away when Ctrl is pressed. The tooltip only goes away if the mouse is moved off the entry.
I'm not sure why it doesn't work for you. The code is written in such a way that whenever a key is pressed, the tip disappears. Are you sure you are using the final 2.3 build from the web site?