Re: "SELECT" problem on 7.0.3

What locale and encoding are you using?

Evidently the LIKE index optimization is failing, but I would
not have guessed that a string like 1:0: would cause a problem,
especially not if all the entries in the column contain just
digits and colons.

You can find plenty of material about LIKE+index problems in
the list archives.  For 7.1, we've gone so far as to disable
the optimization altogether in non-ASCII locales (and I'm sure
we'll get complaints about that, too :-().
        regards, tom lane