New Post: Labels poorly drawn without Frame

Hi, I think you are doing everything right but apparently our automatic selection of rendering hint for text has some flaw. On my Windows 8.1 I wasn't able to reproduce your problem. Does the problem appears for other fonts? Do changes of Windows settings have any effect? Perhaps try to use frames or white fill for polygons as a workaround. And I'll try to offer a better solution in the next hot fix.

I also created an issue: https://mapwingis.codeplex.com/workitem/25975

Regards,
Sergei