I don't see hints in Netbeans 6.9.1

When something is wrong in code, light bulb appears and when i moved over it, a yellow box with some information appears. It also says, Alt-Enter shows hints. This is my problem, i can't see those hints.

I had no problem with hints in v开发者_运维百科ersion 6.7, but now i don't know what happened.

Any help would be appreciated!

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Go to Tools->Options menu, then select Editor->Hints tabs and check the checkboxes selections.