Hoathy has sent me a PM:
I was hit by a creeper while AFK inside spawn waiting for it to be day. Some minor damage to the wall that I tried to fix but for some reason I can't place any blocks.
One block from the mystcraft portal is also missing and it currently isnt functional.
Like I said I have tried to fix it. I will be more careful with my AFK night spots in future. I really am sorry.
We might have to change the size of the spawn protection, if we want players to be able to repair this.