Today my YaST started rendering lines like this:

It makes it difficult to read.. Any idea what this is about and how I can fix it? I tried rebooting, no dice.
Edit -- here's my PuTTY config:

Character set is UTF-8
Permanent solution for your problem:
For one user:
cd ~
echo "export NCURSES_NO_UTF8_ACS=1" >> .bashrc
source ~/.bashrc
The last line applies changes to the current terminal immediately.
For all users:
echo "export NCURSES_NO_UTF8_ACS=1" >> /etc/bash.bashrc.local
In PuTTY 0.81 (and possibly some earlier releases):
Settings > Window > Translation
Mark the checkbox [v] Enable VT100 drawing even in UTF-8 mode