I search for questions through questions/tagged using the OR operator. Here's a screen-shot that shows the problem:

My "Interesting tags" selections are not visible but match the query as visible in the upper right.

• First visible question has three tags that I have selected as interesting tags, no highlight.
• Second visible question has two interesting tags, no highlight.
• Thirst visible question has one interesting tag, highlighted.

At least here, it is doing the exact opposite of what it should do. I assume it has something to do with the OR operator, if it is easier to fix by just highlighting them all then please don't hesitate to fix it that way.