You what it's like; you have several games using a rule system. Not all the situations you might want/need covered are in there, so you agree with your friends an approach to take. You then leave the system for a few weeks and when you go back to it, there is confusion over what was and wasn't agreed... This is what my gaming group had with Dragon Rampant a few weeks back.
The simple way forward is of course to write down this stuff down, so I resolved to put pen to paper and write up a set of 'House Rules' that we could all agree on.
My efforts can be downloaded at this link, and reflect our collective thinking after playing some 50+ games.
If you have any questions or suggestions for improvements, feel free to post them here :)