Unfortunately I can't verify your issue on XP, either:
The other thing I'd try (in the "turn it off and on again" vein of troubleshooting) would be to remove Meslo, download it again from https://github.com/andreberg/Meslo-Font and re-install it. The reason I mention this bit of paranoia is that I seem to recall there were various forks of Meslo floating around at some point and maybe you're using one them?
It may also make sense to start a fresh thread. As my issue was resolved a few posts up, there may not be enough eyes reading all the way through.
As for Windows' font rendering, yes, it stinks. As a habitual typophile and occasional web designer, it drives me up the wall. One thing that almost always improves even poorly rendered fonts is white space, I don't know how I used to live before sublime added the line_padding options.