God Dammit.
To add the missing screenshots, I moved the Blockland folder from my program files to the disk.
Doing this made me somehow lose every single one of my addons (including maps). This means that any progress I made on my ship, which was based in the Sector X map, is completely gone.
This stuff is annoying the forget out of me.
Ghoul, I can help you with that.
You have your stuff in "Virtual Store", so you need to go to
C:\Users\YourName\AppData\Local\VirtualStore\Program Files\Blockland
All RTB add-ons and screenshots are there.
Oh and have "Show hidden files, drives, and images." in folder options.