Originally Posted by Bongleur
the "buttons" to get to functions are overlaid on top of each other: This seems to be related to what ZOOM or font size I am using.
1) What browser are you using?
2) What operating system are you using?
3) Where have you changed the zoom or font settings?
4) Does restoring them to the default fix the issue for you?
The answers to the first three questions are important to see if this is a "you" problem or a "FIREcalc" problem. And by you, I just mean specific to your setup, which would require more troubleshooting.
If I can replicate your issue, I might be able to suggest an easy fix, either for you or for the author.