Within the last hour I've started losing letters. This happened after all my programs crashed except for pidgin. (needed to Ctrl+Alt+Backspace)
If I go to google.com queries containing numbers, some of the punctuation and a few capital letters don't appear. The same characters are missing from the search results.
If I open Writer and change the font to "Arial" then the same letters don't appear. Though they do appear in Terminal, askubuntu.com, etc. So I assume it is a font specific problem?
Why is this happening? How can I diagnose and fix it?