After playing around with the settings I'm able to resize after I enabled Compability.
If I turn off Compability again I can still resize.
I also tested after restart of the game and the resize still works.

Thank you for letting us know! :)
A few questions..

Originally posted by kaistian:

The "windows" on the right where all the pieces start is only two columns wide.
When I drag it wider it always goes back to two columns.

This started to happen in one of the lastest updates.

I'm running version 1.0.9.19 on Kubuntu 20.04.

What controller are you using (Mouse, gamepad, touch, keyboard)? If you're not playing using a gamepad, do you have one connected to the computer?
Is it always specifically two columns it locks on to, no matter puzzle orientation and so on?

Originally posted by kaistian:

After playing around with the settings I'm able to resize after I enabled Compability.
If I turn off Compability again I can still resize.
I also tested after restart of the game and the resize still works.

When you say compability, do you mean "Compability shader" in Animated puzzles settings menu or the compability branch in Steams game properties?

Originally posted by Mexond:

What controller are you using (Mouse, gamepad, touch, keyboard)? If you're not playing using a gamepad, do you have one connected to the computer?
Is it always specifically two columns it locks on to, no matter puzzle orientation and so on?

I'm using the mouse, but have a keyboard and a Microsoft Corp. Xbox 360 Wireless Adapter connected.
At the time I had the problem the gamepad was off but the Wireless adapter was plugged in since I always has the adapter in the USB port.

It was always to column, I only tried it with this one puzzle.

Originally posted by Mexond:

When you say compability, do you mean "Compability shader" in Animated puzzles settings menu or the compability branch in Steams game properties?

It was the "Compability shader" in Animated puzzles settings.

Just to make sure.
I don't have the problem anymore, it went away after I turn Compability shader on.
And if I turn Compability shader off again the resizing stick when I release the mouse button.

Just for the fun of it since you mention gamepad. I turned the gamepad on, but the resizing work without problem and as long as I play with the mouse it says like that. But when I use the gamepad it shrinks to 2.25 of a column.
But when I had the problem, is was exactly 2 columns and not 2.25 as with the gamepad.
So it don't think that was the problem I had.
The problem I had looks like a one-time glitch because I can't recreate the behavior no matter what I try.

Thank you for your detailed reply! We'll do our best to find the bug. Let us know if you bump in to this again!