Corruption in Project file

Hi there!

I am trying out sequences, finally. The concept has some benefit to it, but the project I am trying it out on suffered major corruption and I am trying to figure out why.

I was going to color correct each scene on it's own in a sequence, and then put all the scenes together in a master sequence where I could then grade each scene as a whole, and render the entire project from.

So, the first question I want to ask... is a sequence of sequences supported? (The corruption I am seeing is clips from different scenes mixed together in the same scene)