Is my screensaver broken?

[stevas]

Pi Model: 4
Power Supply used: official Pi4
RetroPie Version Used: 4.6.1
Built From: retropie-buster-4.6-rpi4.img
USB Devices connected: 64gb thumb drive
Controller used: M30 8bitdo
Error messages received: none
Emulator: none

How to replicate the problem (if it even is one):
To be clear, I'm not sure what SHOULD happen with "screensaver controls" on while using just images? All the buttons do the same thing, i.e. nothing, they just stop the screensaver and return me to exactly where I was. I was under the impression I could, say, press start while in screensaver, and it would helpfully jump to the game showing?
Also, a strange peculiarity: on exiting screensaver, I get notification of what the game was I last seen, but... over whatever video is currently showing (on, as I say, the list I've been returned to)?
Of course, that requires that a video actually is on show there; if not, I won't get that notification at all.

I forgot to add: I've used Skraper to create videos and images.
Also, I've changed literally nothing and now the screensaver has just stopped working completely. I did set it to kick in after 5 seconds, which was working fine.

[stevas]

Okay.

It appears screensaver controls only work with videos - is that right?

Also, while it did initially work setting the screensaver to activate after 5 secs, it decided it didn't like it after a while, and it appears fine with it set back to the minute again. (I'm assuming the GUI not allowing me to go below a minute is something of a warning, here.)

So now my main question really is: has anyone used Skraper recently? It seems great, but try as I might I cannot get the video resizing to work.