Suggestion.
Remove all the VST paths (note them down first!) and reset.
Do you get the error?
Add one back in and rescan?
Do you get the error?
Repeat until the error comes up. Then look in that folder and its subfolders for anything that looks "odd".
How noticeable is the effect in the rhythm guitar part in the example you gave (I tried a demo of this or a similar product and didn't notice any beneficial effect on the mix, but that might have been me :-))?
Ditto with the 15% which is why I'm thinking Filterverse! Comet is nice - I'm never sure when a reverb is a "good" reverb but I find I can get very good unusual and special effects with it (I made an accidental mistake when using it and it made such a good effect, I used it as the basis of an entire song!): https://www.bandlab.com/track/f8db7168a32de81180c300155d60d108_64c77c80efd74f51bf466b2e0d5540d0
Double check the bus outputs haven't changed. If they have, reset them; if they haven't, change them to None, then change them back to what they should be.