Could there perhaps be some technical issue with the forum?
With cleartype disabled on my system, the fonts suddenly are very ugly again.
It looks like something might be broken in presenting the replacement fonts in case of 'cleartype=disabled'.
Perhaps somebody could confirm this?
(There also have been some updates from both Windows 10 and Firefox today, so I am not sure what might cause this)
To give an impression how it looks with cleartype off (2x enlarged):