Thanks, can confirm, tracked as https://www.ventismedia.com/mantis/view.php?id=18849 (fix hasn't been committed yet but it should be by the next build)

Yes, indeed same for me. Code monkey tabs centred and don't work

Material design tabs work OK

I prefer code monkey because text lines are more compact. I get about 50% more lines on t he screen.

I can confirm it works fine with Material Design skin. The tabs appear to the left and work as expected. I have four other skins: Code Monkey, Metro M (Classic), Monkey Groove and Shades of Grey. All of the these skins have the same problem as told in first post. Their tabs all shift to the centre of the top line and stop working.

Which skin are you using? I can't reproduce with Material Design.

Since moving to: MediaMonkey_5.0.3.2607_Debug, tabs have moved to centre of top line and and can't be accessed (clicked on - left or right mouse buttons), added or current tabs deleted. It is sometimes possible to switch with CTRL-Tab, but this is unreliable and doesn't always work.

Switching back to: MediaMonkey_5.0.3.2604_Debug, resolves this problem.