ok weird this seems to be linked with my issue, as I'm getting this and a variation of this behavour on seperate installs on the same machine,
on my main install my list view headings have this behaviour, invisible on first launch and return when toggling views, I decided to install a clean version of LB just to see what happens and now this clean install does exactly what is mentioned here, the headings are ok but the scrollbar is now gone on startup.
So it just seems with list view there is always one UI element that isn't rendering.
Is there a link to the bitbucket issue for this as I couldn't find it.
Edit - and one extra question, are people with this issue running off an ssd? as this issue seemed to come up for me when I moved over from a traditional hdd to an ssd.