By "edited" I'm assuming you mean you trimmed the clips and placed the trimmed bits on a sequence? What Ann (quite an expert) was mentioning was pointing out that PrPro doesn't need transcoding for doing editing, it works fine in nearly any camera output format. If you've not actually trimmed anything, it would be quicker to just use your original footage than puzzle this out.
As noted above, PrPro typically supports projects coming over from FCP7 though there are hitches on occasion. So there is something between the way FCP output those particular files and the way PrPro is reading them that is out of whack. At this point, if you want to try to resuscitate those "non-supported" outputs, comparing ALL the details of those against the details of those that PrPro "took" would be the way to find the issue. Including footage type & location, transcoding settings, locations of transcoded footage, properties of transcoded footage, the way they're referenced in FCP, that sort of thing.
Are they say from the same timeline/sequence, some of the sequence transfer ok but some don't? Then what are the properties of those and are there any differences in any setting between the ones that came across and those that didn't?
If the problem children are entire timeline/sequences, what again are the differences between the sequences that transferred and those that didn't?
If the problem children are all of certain projects, and the entire project "failed" but other projects worked, then one would look at the project settings. This will take some detail sifting.
Neil