I did not find any solution on that.

Had to go back to FP8.

That works for me.

All that remains is to pray and hope for IBM ... (or HCL)

Why FP8?

With FP9 if you set the DPI override in the Compatibility tab of the Notes link properties, and the system environment variable NO_DPIAWARE you get a clear UI.

I can pray IBM, HCL, Ray Ozzie or even the devil itself  Especially after having installed FP10 on the Domino Server, getting now a messed up Subject for every UTF8 e-mail