Clicking the Revisions "tab" at the top of every wiki page (http://te4.org/node/NNNN/revisions) gives a screen showing the 5 most recent changes to a given page. However, the topmost one (the most recent) is "highlighted" by having white text on a light yellow background, which makes the text virtually unreadable.
It looks like it's coming from the <td class="revision-current"> tag, if that helps.
Example: http://te4.org/node/930/revisions
[Wiki] Revision history colors obscure most recent entry
Moderator: Moderator
Re: [Wiki] Revision history colors obscure most recent entry
fixed
[tome] joylove: You can't just release an expansion like one would release a Kraken XD
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[tome] phantomfrettchen: your ability not to tease anyone is simply stunning
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[tome] phantomfrettchen: your ability not to tease anyone is simply stunning