[pkscout]

AS does the text replacement by default now, so there is no enabling it.  By default it does Windows style replacements, which I generally recommend because Windows is the most restrictive in terms of characters for replacement.  Could you enable both Kodi and AS debug logging, try an artist you know should generate a problem, and post the log?  I'll take a look at it.

NVM, I think I must have messed something up, just reinstalled the addon, replaced '_' for '-' and it's working now
BTW, is there a way to include the root artist fanart to the slideshow? Only the ones on 'extrafanart' folder are getting displayed 

Yes there is.  In the slideshow section of the settings there is an option to include the root level fanart and folder files.  All that and more is explained on the Wiki page for AS (link in my sig). 😜