In the case of lindex's code, the ^M at the beginning was causing the problem, and chipmunk was able to suppress this by having the code start directly after the <code> tag. In the case of the two Perligata obfu's I mention, the problem lies in the ^M after the "finis" and before the start of the DATA. I can't seem to find a way to suppress this from within the edit box.
Codici obfuscati actually worked when I first uploaded it, (I downloaded it to check...). Now, however, I get an error (Accusitive not connected at line 20). (The error in the other program complains about "Something barbarous (i.e. punctuation) found" in the DATA lines.) Thus, I assume that this is a recent change, but one that I hope can be fixed.