Nadya,

>It's weird, why we have the same problem again and again? It now seems to happen in each two/three days (e.g. instead of normal message I see a script).

In all likelihood, one of his multiple EXE automation servers has gone crazy and needs to be restarted, and perhaps no one available to do it (webmaster is traveling, etc). That's why some hits are OK and some get the mess -- the hits are handled round-robin among the servers instantiated.