John, this is ludicrous. Between major versions 4 an 5 or 5 and 6, okay. Just barely okay. Ideally the new .dop files would be as retroactively compatible as possible. I.e. new functionality would not be read by older versions but existing functionality would be read.
Between point releases 6.2 and 6.3, it’s just ridiculous and a kick in the crotch from lazy DxO developers. If DxO are seeking ways to make their photographers loathe the company, incompatibility between point releases is a good place to start.
That said, all the crowing about keeping the whole image visible when cropping and all the crying about it after the change illustrates just what a thankless job software development is.
To boot, this is a great illustration of the consequences of making the Mac and Windows versions of PhotoLab identical. Both sides are now miserable instead of just one.