exxocet

Thanks for your help, esmi!

Oh ya, this is weird!
After all those from above, I’ve moved back the plugins to their folder and reactivated my default theme (Pagelines). And Voila! Akismet is working again all of a sudden!

Affirmative. I’ve switched to Twenty Fourteen, deactivated all other plugins, except Akismet (I’ve moved other plugins out of the Plugins folder).
12-14, only Akismet and no good. Akismet panel is still blank.
I presume it’s an incompatobility with my server or so, as another wordpress blog I run on the same server, blog which is was updated for ages (WP 3.0.5 and Akismet 2.x) has the same issue.