I'm running ubuntu 14.10 on a lenovo yoga pro 3. Specifically I followed the instructions detailed here during the istallation process:
When I login to Ubuntu sometimes the fonts are fine, other times they look as they do in this screen shot. (Sorry I don't have enough reputation to post direct images). On certain applications however, ie chrome the fonts are fine.
As you can see some of the fonts in some of the windows are corrupted. This problem happened very rarely until recently when I did,
sudo apt-get update
I've also tried things like restarting lightdm but to no eval.