It hurt me up a lot, but it worked at first attempt. I'll be about one year with using profiles this way and it has worked for me so far.
I find it hard to believe because looking at my historial all the pages point to me --user-data-dir but now when I check out the two sets of shortcuts, the RocketDock shortcuts and a .BAT file that I have to automate the operations with files and the execution of Opera profiles, everything comes with just one - and I assure you that RocketDock and the .BAT haven't been modified.
And it's also not an update thing since I've been downloading previous versions with the same result.
Where's the hidden cam?
PD. The key is that works again, thnks @burnout426