It took me 14 attempts with Combat Tracker to get through a single combat without having it crash on me. I can't use this in a game.
Also, I noticed a few things:
1- Information entered in the action dialog at the beginning of a round is not transferred to the action. Example: near the end of the fight a PC changed his target (having killed the previous target). When I clicked the melee attack button, it was still on the old (now dead) target.
2- I had a character with 3 rounds of stun, on the first round all the rounds of stun vanished. I appeared like the results of the attack overwrites the existing status (a new attack with 0 rounds of stun canceled the all the remaining stuns).
3- Bleeding does not appear to be taken into account, or it gets overwritten like the stun results (I didn't pay attention to that aspect)
4- Penalties from criticals are not taken into account and the modifier button does not appear to have any effect.
I will not continue testing at this point. The time is better spent improving the Excel spreadsheet I was using before.