Yes there are a couple of known bugs:

1) The battle calc will seg fault (crash) if you change one fleet of a specific type (for example adds 1k black widows in a cathaar fleet), and then clicks on a fleet of the same type (for example, if you after you've added those black widoes clicks on another cathaar fleet).
Workaround: just click on a fleet of a different type between the clicks..

Might be a QT bug, looks like that on the backtrace, not sure yet.. 

2) The input of roids and score for a planet is buggy.. 
have to check into this.. 



Other:
There are a couple of known flaws in my code (for example that my roid distribution doesn't take into account the number of pods each player has).

A few rounding errors so that N + 1 ships gets killed instead of the avarage N and so on.. 

There is prolly a few others of the type above, I'm going to look into it when I feel the need.

If you read the source and feels that something is very bad designed, or I do some calculations wrong: Please comment, I'm willing to learn and make my calc better.. ;)