[gentoo-user] Some symbols render incomplete in text mode

[gevisz]

After a recent update of my Gentoo system,
I have noticed that some symbols may be
rendered incomplete in a text mode.

It happens in Gvim, in a web-browser and
in a dialog-window for saving files.
Maybe, also in xterm but I am not quite sure about it.
So, it is not specific to any application.

For example, while saving a web-page from
a google-chrome, I sometimes cannot see a dot
before html. However, it is present there.
Some letters can be shown without their
top parts. In youtube videos, I may see only
the lower part of a gear that denotes some
customization features and so on.

However, I do not see any distortion
in playing videos.

Does anybody have any idea on what may
cause such effects?