A long time ago, I think it was with one of the Christmas themes, I complained that I could hardly read the forum. I had to highlight all the text. I think that improved after that season. But, for a long time now I've had a very difficult time and have been highlighting everything.
Recently, I forget if it was with the Christmas theme or even before that, the titles of threads are almost invisible and those don't highlight. I've been debating whether to ask about it.
Suddenly today it's all fixed!! The titles are bright and very visible and even the text can be seen. The blue ones are better than the other, but all can be seen without highlighting.
I don't know what you did, but hopefully you can keep it this way!!!!