Meida pending can be due to extra-long filenames ... because remember, the entire folder tree is actually part of the filename. So if your media is in the fourth level folder, each one with a longish name ... those names are part of the filename PrPro deals with. Too many characters, PrPro gets cranky.
There have been some users that simply simplified their file structure and folder naming protocols and suddenly things imported fine.
Also, some characters in a filename can be an issue.
Not saying either of these is the case with you, but ... if you haven't checked them, might be worth doing.