Glad it worked for you. It's comforting to know that others have the same issue. But only because it justifies a real, yet obscure ghost in the machine. Could be NJ electricity. Tues I'm attacking like it Danny did.Just to chime in for info purposes really, I had similar issues when I updated to the first 18 beta. All the body in my favourite presets was lost and they sounded empty and boxy with no sustain. It felt like I had accidentally turned down the volume on my guitar or bypassed the amp block. I just reverted back to 17 and waited for the official release of 18. I updated again when this was released but encountered the same issue so I figured it was just a case of starting from scratch and I managed to get some of the meat back into my tones but tbh it still didn't feel quite right, at least not as nice to play as 17 was. Even the new factory presets sounded kind of average. After reading through this thread I installed 18.04 and did a system reset at the same time and bang there it was back to full meaty goodness and sounding fabulous again which was a hell of a relief because I was starting to think I was either going mad, or simply didn't appreciate the new 'reality'.
I have an XL (and before that a std and MKII) and religiously follow the correct update process using fractal bot. I've never experienced this before so it must be some kind of very random glitch that occurs occasionally?