Thanks, I have reproduced this. Tracked as: https://www.ventismedia.com/mantis/view.php?id=14911

No, removing persistent.json did not fix it.

Here's a video demonstrating it.
https://gyazo.com/8a46e6fb8e2ab030f4d9cca0050bfa9f

[quote=malkierian post_id=446732 time=1529781217 user_id=90301]
You have to double click a specific genre. It's not in the list of genres, but in the tracklists of the genres.
[/quote]

Hmm, I still can't replicate. i.e. scrollbars are both shown as expected for me.

Could you try to temporarily remove your persistent.json file from /Portable/ folder? Does it help to resolve the issue?
If yes, could you send me your persistent.json ?

You have to double click a specific genre. It's not in the list of genres, but in the tracklists of the genres.

Ho could you switch to 'List view' in [Music > Genres] ? I don't see the option at all.
In [Music > Artists] I see the 'List view' option, but using it I see both scrollbars as expected:
https://www.dropbox.com/s/mxwe4s86mfyd3by/Screenshot%202018-06-22%2010.51.32.png?dl=0

Could you try to temporarily remove your persistent.json file from /Portable/ folder? Does it help to resolve the issue?
If yes, could you send me your persistent.json ?

So I just felt like bringing up the genres listing so I could fix my database for just one particular genre. Brought it up, loaded all tracks, switched to List View. This is what I get:

https://i.gyazo.com/ca6f4eddd4030afc45bf048b8c57aec3.png

As you can see, there's no horizontal scrollbar, and dragging the mouse wheel click over (so that the little arrow thing appears) also doesn't work. However, as you can see with the screenshot, I have Path selected for view, but it's not visible, and yet scrolling isn't possible.

This seems to be a problem with any of the non-standard nodes (meaning albums, artists or album artists). Years also has the problem, and I'm guessing there might be others, but I don't have gold, so I can't change the visible nodes to find out.