I have an old application that is compiled with gtk and glib version 1.2.10. I cannot change this. I've been running it on Ubuntu 12.04.2 LTS for a few months now without any real issues. The other day I noticed that the GUI had gotten screwed up.
The original look:
The way it looks now:
When I try to open one of the monitoring windows I get this output:
REG_FONT (-adobe-courier-bold-r-normal---120---m-*-iso8859-1) was not found. Using default font. LARGE_FONT (-adobe-courier-bold-r-normal---180---m-*-iso8859-1) was not found. Using default font. PLOT_FONT (-adobe-courier-medium-r-normal---120---m-*-iso8859-1) was not found. Sampling display values will be disabled. Check README file for more info.
I'm not certain what any of that means, other than it's looking for a font that it can't find. Whether the font was removed, a default was changed, or something else happened, I don't know. I didn't do anything intentionally.
I haven't changed anything in the glib/gtk directories in at least a year, so I don't think it was anything I have done directly. I haven't played with any system settings either. I do regular updates, but that's about it.
I have seen this issue on Centos 6 machines as well, so I'm not certain that it is a Ubuntu specific issue.