Could it have anything to do with this transient glitch?
It happens when I start calibre in the Test library or switch to it. As soon I select another book the problem goes away, i.e. VL Vanilla show same content as VL Taglike except its white non-clickable text.
Screenshots of VL Vanilla column and temp VL definitions attached.
@
chaley - I can PM you the Test library database if you're interested, I don't regard this as a bug because it's not a real world scenario.
Win 10, Calibre 6.7.1
BR
PS : I did a database restore - glitch persists