Can I change font Color and/or Type for IDE 1.5.6r2? The program becomes harder to read (at least on my particular monitor) after upgrading. 

Any way to change font Color to darker color and/or Type to thicker stroke (like B in this question editor) for IDE 1.5.6r2?
Yes.

Under the file menu select the preferences. From this you can find and than view/edit the preferences.txt file, which has the color settings.

Example preferences.txt