Compare the two, html diff is correct, and also no text is shown below the buggy diff.
http://translatewiki.net/w/i.php?title=Sandbox2&diff=1103115&oldid=873615
http://translatewiki.net/w/i.php?title=Sandbox2&diff=1103115&oldid=873615&htmldiff=1
Version: 1.15.x
Severity: major
URL: http://translatewiki.net/w/i.php?title=Sandbox2&diff=1103115&oldid=873615