I am using Columns UI with PSS. Interestingly enough, this issue doesn't happen with the Biography script even though the PSS script for the background is literally the same for both: $drawrect(0,0,%_width%,%_height%,$get_ps_global(bg.color),$get_ps_global(bg.color),)
If I check Forced Layout the panel is just blank.
I managed to record it with Fraps and uploaded the video to YouTube: https://www.youtube.com/watch?v=CVkfSB-1mig . You can use 0.25 speed and see how the border briefly flashes when switching to the next song.
Edit: I managed to crash the panel by right clicking in a specific spot somewhere on the top edge of the panel: https://i.imgur.com/KyAGSx2.png. My mouse cursor was exactly at the upper left edge of the right click dialogue. Reloading the panel fixes the error. I am not sure if it's a bug in Library Tree or in JScript panel. The error is the following:
Error: JScript Panel v2.0.6 (Library Tree v1.3.9.2 by WilB)
JavaScript runtime error:
Unable to get property 'rbtn_up' of undefined or null reference
File: <main>
Line: 1411, Col: 85
<source text only available at compile time>