I upgraded to the amd64 snapshot today (30 December) and since then lots of programs in X (gvim, firefox, libreoffice) give a warning for /usr/X11R6/lib/libfreetype.so.23.0: size mismatch, relink your program.
The affected programs run with incorrect fonts. Is it just a matter of waiting a few days for a fix or can I do something about it?