A screenshot of the problem on my site.
In 1.15.1, on the "files" tab of preferences, this is the text i see:
Image size limit:<br />''(for file description pages)''
The html tag shouldn't be showing as text.
Version: 1.15.x
Severity: trivial
URL: http://tmbw.net/wiki/Special:Preferences?useskin=monobook#prefsection-2
Attached: