I moved over from 32 to 64 bit recently and the font on the plug menu is larger in 64 bit, can it be sized down?
 
 

That's very odd. I've never seen that difference between 32-bit and 64-bit versions of anything.  I have always wanted a larger font for everything in SONAR but the only way I have been able to accomplish that is with the scaling options in Windows or increasing/decreasing resolution on the monitor.  Let us know if you figure out a way to customize.

Check your screen settings.

Based on a previous post, is it possible this not just a change from 32bit to 64bit but a change to a new PC as well?