Number Breakdowns
 

In Hero Lab Classic a lot of numbers give a breakdown when you mouse over them.

This feature does not currently seem to be implemented in Hero Lab Online.

This is a very useful tool for verifying number accuracy as there are quite a few areas where Hero Lab can generate wonky numbers (e.g. Numbers entered on the adjustments tab will sometimes work, sometime will not work.)

It is also useful for tracking down which numbers can be improved during optimization.

Edit: lack of a mouseover with a breakdown is resulting in a lot of guesswork on my behalf trying to figure out what is going on with Flurry of Blows + Dragon Style.