Upgrading from 17.x to 18.x did bork some of my presets as well, particularly due to the resets in the advanced parameters. I had several adjustments in the speaker page (low resonance frequency and level) to get the bass response I wanted while having the Cut switch enabled, trying to stay out of bass territory. As it turns out, Cut removed things a bit too drastically for my liking. I reverted back to 17.x to make sure I wanted to upgrade, but there was something in the feel and response of 18 that I 'missed' in 17, although I only noticed whatever was 'missing' after having played with 18 for a bit. Which is crazy to me, since I hardly consider myself a tone 'connaisseur' or pretend to know anything about playing tube amps.
Anyway, now on 18 I'm leaving Cut untouched, instead doing my lo- and hi-cuts at the end of my signal chain in a PEQ block (shelving filters, range from 100 to 6500 Hz IIRC). With that, I simply re-evaluated my amp block settings, which then only needed small adjustments to bass-mid-treble to get the tone I'm happy with again; no need to go into any advanced parameters for me. In case of my Friedman BE-based patches it also involved some tweaking of the gain and master volume to get in the ballpark again. I don't think I'm there yet in that particular case, I'll probably check out some of the new Factory IRs to see if that helps.
But yes, I've had to rethink my presets a bit, but for the better as they're even less involved/complicated to dial in now. Moreover, the amount of re-tweaking I've had to do has been rather minimal. I suppose it helps I'm pretty set in my amp type and IR choices, requiring less time to search for something that works for me.
