The error only occurs upon entering a mission even in the simulator. Also with the ship viewer, the game thinks that there are 45 ships when there are only 44. It crashes complaining that it can't find a file....found the error, there is an extra enter at the bottom of the shipviewer file.
Error message for above is "You used too many elements in weapons.xml , please declare more." I can't seem to find where the problem is at in the weapons.xml file.
The problem only occurs with the 1.6.2 patch however.