Let’s see if the developers/publisher of this game read the GOG forums… (I’d be surprised if they do since these forums lack any form of notification :( )

Anyway, the "jigsaw puzzle" game in the ruins in Enigmatis is broken: once I’ve moved a piece once, I can’t move it anymore.

(In the Linux version)

Edit: it also happens in the other puzzle game in the bonus section.

Almost four years later and it's still the case. No fix has been provided, but thankfully the workaround of skipping the puzzle at the end of the countdown prevents us from being blocked.