Right now the mk1 crew cabin seats its passengers on one side of the cabin and this causes it to give my craft an uneven weight distribution and a an off-center center of mass. It is significant enough that it prevents me from launching spacecraft with the mk1 crew cabin because they always tip over on the side where the passengers are sitting. It's very annoying.
I discovered this after troubleshooting for the last 3 hours to isolate the cause of my spacecraft's lack of balance. To replicate for yourself, just make a small, simple, perfectly symmetrical craft with the mk1 crew cabin and passengers inside it. In my tests I've discovered that apparently the seats themselves are light enough that they don't really make a difference, it only becomes a big problem when there are passengers.
Please, please, make the seats in the cabin in the center of the part. Or put the two seats on opposite sides.
