I should have been more specific, sorry... I mean bit depth and bit rate... On some machines this defaults correctly and on other machines it is wrong. Not sure how to set these to downconvert properly by default. Unless it automatically takes the format of the source file, in which case it's just been luck.
The bit depth and rate is set for a newly opened session by what is saved as the Default session. This can be accessed from the File menu Default Session. You can save your current session as the Default from there. So make sure that all your settings are correct and then save the current session as default. You should thus be able to get all PCs the same. Hope that helps.