@Quzah Thanks, that looks like a bug in the JS rendering code. I'll make a note to look into it. If you're desperate, I imagine adding a // comment in the first line would solve the problem.

Code:
// a beautiful string of ones
     1
    1
   1
  1
 1
1
@VirtualAce There haven't been any vBulletin updates that would affect editing since this one (4.1.9 was supposedly mobile-only). However, 4.1.10 just came out, and it's supposed to fix a lot of bugs (including the one you ran into earlier) so I'm going to upgrade tonight. I'd love to know if it solves the issues you ran into.