The same here, after upgrading to the latest Paragon NTFS 15.0.911 bootcamp partition cannot boot again (it isn'y visible starting with option key pressed and cannot be selected in preference start disk in macOS High Sierra Side). When you will release a fix this?
it seems there's no other solution from Paragon support... For me it was a nightmare, Windows partition couldn't boot more.
May be there were some discuti terminal command parameter but I wouldn't risk to lose mac partition.
I had to remake bootcamp partition from the beginning (and bootcamp was not so nice with several failed attempts before having a new working windows 10 partition again.
So for me the solution was to completely uninstall Paragon 15 and throw away my paragon license and money too.
A completely unsatisfied customer