Game 'softlocks' on trying to swap crew.

[Xurkitree]

Oh hello there. I have a heavily modded KSP 1.7.0 OPM install, which I have using to complete a Jool-5 Mission. The problem is, after updating to 1.7, I am not able to swap/select/remove crew from vessels in the VAB or SPH. I was making a crew recovery vessel and two kerbonauts snuck onboard, so when I reverted to remove them, upon pressing the crew tab, the game kinda softlocks.

All the buttons grey out on the left side. I am unable to swap crew, change action groups or add any part. I am able to swap facilities, but the problem persists. The right side is mostly unaffected - I am able to create a new vessel (although I cannot add anything), open a saved vessel, launch or exit. But sometimes, this goes as well.

Quicksaving and quickloading, or a hard reset don't help. I have confirmed this isn't stock beahviour. I'm currently stopped work on that install (I launched the vessel i needed to complete the mission by removing the crew on the launchpad and recovering them), but since I have such a large modlist (for me atleast), I don't know where to start with finding which mod works. Furthermore, the mod loading times are rather big, so repeatedly testing which mods or mods combinations cause this would a huge hassle.

I post this in order to find whether other users are also experiencing this, or whether anyone can give any insight on which mods to test.

https://imgur.com/5om5dat 

Here is a picture of my Game Data folder, incase you want to check for any mod.

Any help would be greatly appreciated. Thank you in advance!

[JadeOfMaar]

The cause is in Action Groups (Re)Extended. I've already reported it to LGG. And it looks like he posted a fix.

https://forum.kerbalspaceprogram.com/index.php?/topic/167269-17-action-groups-reextended-250-action-groups-in-flight-editing/