Mathematica 5.2.2 uses only one core

Using Activity Monitor, I have seen that Mathematica 5.2.2 uses only the second core, even if Wolfram says that it supports multi-core calculations.
So, firstly, I use only half of the power of my MBP C2D and secondly this could be dangerous for the processor because I use Mathematica all the day for work and this asymmetric use of the processor could damage it.
Do somebody know how to use both the cores?

This is a Mathematica problem. Contact their technical support. The Apple Discussions are limited to assistance with Apple products. We can't fix a problem with Mathematica software.
Furthermore, there's no reason why the use of one core will damage your processor.

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Link to image 1
Link to image 2
Moderator note: large image(s) converted to link(s): About Posting Pictures In The Forums
Solved!
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Mathematica 5.2.2 uses only one core

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