This issue has been flagged before but all the other tickets have been closed. In your last reply, you advised us to remove the hidable flag from them, and you closed the ticket without waiting for an answer. I tried that, and it didn't work. Here's my whole config: http://pastebin.com/eZg18XgX.
Here's how it looks like:

Removing the hidable flag or just resetting the database won't work, I tried both. Please look into it, my players keep asking when will be the bug fixed.
Thanks!

You'll have to remove the flag from the existing blocks as well. Try /ps disableall hidable

I did thtat, and here's what I got:

I can still see the stones on the horizon.

Please...

Ignoring those bugs won't help anyone...

@dadus33 mentioned teleportation in my similar but seemingly different issue (#859) so I figured I'd test it. Without fail, teleportation always triggers this bug when teleporting into a field that contains the hidable flag and has been hidden. Fields with the hidable flag do cause this, but it's very possible that it's not the only thing that can considering this ticket.
I'm adding this here as it relates to the now closed #834 #837 which seem to be the same issue but didn't mention teleportation. It's a possible lead at least.

A temporary but not very practical solution I found for both my issue and this is re-connecting to the server. That seems to fix it, if only temporarily.