I'm not sure how I did this, so I was wondering if you can help me fix it.
The mini Calendars along the right side of the Daily view show all blank days (the days at the beginning and end of a month) as yellow. How do I get it back to normal?

Wow. I'm not sure how you did it either unless you were changing some of the field definitions in the Calendar table. Barring that, clicking the "reset" button in the lower right of the About tab (its very small) usually works. This doesn't remove any of your data-- it just resets the calendar records, globals, etc. You can read more about it here if your interested: rest documentation.

I haven't had this issue reported before, so let me know if this fixes it.

Thanks for your post.

I did try the reset. Because I had already changed quite a few things the yellow was better than the reset. I did find something that fixed the problem though I am not sure why. It was the placement of that small square field I moved in the appointment window, when I moved it farther from the "More" the yellow went away.

Thank you for all of the help!