I did not have a problem with X6. The graphic loses curves, drops arrows, etc. I support technical writers. Import, export is not a good solution for me. I create a drawing in Corel, that the writer can choose to cut and paste different pieces into Frame maker. The development does not lend itself to a graphic that can be sized and exported easily. I basically have been giving them puzzle pieces that they can use to create the paper. That is why I am looking for a solution that won't change their workflow too much.
If you're using the designer version I believe all you updates need to come from that update area but I'm not sure but will check.
The real issue is if the issue is in X7 and FM 2015 compatibility to test an upgrade fix that the user doing the copying and pasting would need the newer version of CD to cut from and past to.