Problems with Jitter

Hi all, I´m having problems with Jitter. I reinstalled all Max MSP package several times and this doesn't work. It seems that some JItter objects aren´t installed because I see it "brown" when I use them in a patch. A simple example:

the jit.qt.grab objet. The .mxo is in the right folder, I can open the help file but the object doesn´t work anyway¡
Even I tried to copy paste this objects from another computer with Max MSP running smooth and clean.

For now jit.qt.grab and jit.change are not working, I guess they are not the only one which are not working.

Any ideas?

Thank you¡