Emacs 23: Selection not highlighted

I installed Ubuntu 10.04, and with it came Emacs 开发者_开发百科23. If I want to select text in Emacs, that works perfectly fine except the fact that the region is not highlighted.

However, this only happens, if I try to make a region using the keyboard. If I select something with the mouse, it is highlighted as usual.

Does anybody know, why the region is not highlighted and how to fix that?

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Is the option 'Options->Active Region Highlighting' set?

You may want to set

(transient-mark-mode t)

in ~/.emacs or other init files as well.