[TxMt] Invisible characters

[Bonhôte André]

Hi all!

I have a problem with invisible characters here. E.g. writing perl  
code, I use || quite often. I produce this character on my Swiss  
German keyboard using Option-7. Normally, I put a space after || to  
increase readability. There it happens that I keep the option key  
pressed while pressing the space key - and this apparently produces  
some invisible character. In any case, perl complains:

Unrecognized character \xC2 at /Users/abonhote/test2.pl line 5.

I have turned on "show invisibles", but the extra character doesn't  
show up. How can I avoid typing these characters?

Thanks in advance!

André