First, <code> tags are easy to use. When you're entering your post, type something like this:

---

<code>

for my $i (1 .. 10) {
   print "And a $_,\n";
}
[download]

</code>

---

And it will come out looking nice. If you leave off the <code> and </code>, it will be all jumbled together and people will yell at you. Also, instead of typing a row of equal signs like you've been doing, you can instead use <hr>, which stands for horizontal rule.

Second, as runrig says, there's probably something weird in your input file. Try looking at line 1840. Try making a smaller input file to make testing easier.