Hi,
It's actually the same font but drawn with a different technique. The new technique is much faster, so you can have many more labels interactively displayed, and works on more graphics cards. With the new technique, labels are roughly the same size as before in the middle of the scene, smaller in the back and larger in the front. In some cases of extreme depth, you can see pixelation in the labels in the front. You can change the size and type of font in the Background preferences.
Please email why you want the old technique back and maybe I can fix the new technique to address your concerns.
No that's ok. I was mainly just wondering if the font changes were cosmetic or functional, but you seem to have answered that question. Thanks, Sabuj