Hi Dan.
All i can suggest is some basic troubleshooting at this point.
Do you have access to any other c300 footage? (Are you sure there isn’t a problem with the file structure that has been provided to you with this footage?)
Anyone else around with an Avid that can try to load the footage to see if it works for them?
If you have a small enough folder of shots, and can upload it, i’d be happy to try to load a batch and see if I can get it to go. (We can talk off list if you want to about this)
It is not uncommon for user settings to go corrupt. Doesn’t happen as often as it did on final cut, but it happens. Delete your main user settings. Start a new one, or just use the new one you’ve already built.
Perhaps your state settings are corrupt? Under applications, media composer, settings MCState settings. I have deleted this in the past to fix some oddities. This will clean out a lot of your basic settings for the program. It will rebuild itself after a launch and save of settings.
Personally, when stuff goes this wonky, i don’t think twice about uninstalling the program and doing a fresh install. This will force you to re-install all your ama plugins. A lot of people shudder at the thought of an install, but i would rather spend 10 to 15 mins doing that, than hours trying to figure out if the problem may or may not be somewhere else. In 15 mins i can assure myself that the program itself is good.
Double check permissions on all your drives, make sure everybody can access everything.
Never seen this happen, but maybe after the re-install, just start with your mxf and canon plugins, to ensure nothing else is conflicting or corrupting the process.
Sorry, not a “oh, push that red button” answer, but maybe something will work.
Glenn