well it happened to a few people that they can not upload files through ZIMIC control panel, including me.
here some people with the same problem:
http://www.zymic.com/forum/index.php?showtopic=5738
http://www.zymic.com/forum/index.php?showtopic=5742
well, i notice that even if you can not upload the file..you can created a new file and copy and paste the script to that file.
there is a opcion on the control panel that say: CREATE NEW FILE.... just click on that, it will ask yopu for the name of the file and then, will give ask you to introduce the script.
Piero