Someone else mentioned this recently with same media and workflow.
Do you have ability to open the file in another facilty to check scopes?
Test your sequence with another export format . eg avi, QT, Pro res...
Test a clip with Color Bars with no Filter and with Filter.
I've brought this problem up with my editors and reported it to Adobe. It was there in early CS6 but they fixed it by CS 6.0.3 but it has reappeared in Premiere CC.
I have two pictures of the reference monitor, one is a timeline before the .mxf export. One is after. It is clear that Black lower than what is in the original is either being created or something during the export. It doesn't happen if I export to any other format.
It doesn't happen if I export to any other format.
That is probably pointing the issue at mxf or the way Premiere handles mxf.
The forthcoming Premiere Pro CC update includes a fix for an issue with levels and gamut in MXF OP1a encodes. I can't promise that it addresses exactly the problem you're encountering, but I like the odds.
That would be great, Mark. It definitely got broken again between 6.0.3 and CC.