[darthktulu]

I find it easier to read white fonts on a black background. So that's how I set it on Preferences. About 90% of my books appear that way in the Viewer, but other books still show a black font...on a black background which makes them impossible to read.

So I assume it has something to do with the book file, maybe not with calibre. But is there anyway to fix this? (All of my books are MOBI.)