Please see this file:
Take a look at line 21.
If that line is copy and pasted into a "script" section (like pasted into line 9), then some of the characters are changed or displayed differently.
The background color highlighting seems to be related to the problem as the characters change if the line is highlighted in some color. Turning syntax highlighting off seems to resolve the issue.
Why is this? Is it a bug? Thanks.
NOTE: I tried attaching the file but it didn't work... the system just sat there "uploading".