Hi Wolfgang,
If the loop is making the form unresponsive as soon as you open it, here's something you can try. Rename the .pp7 file to .zip, and open it as a zip file. Look for the file "Form.xml", and extract it. This contains all the layout for your form in XML format. Do a search for your PressTalk code that you need to modify, and then add the &printermode exception to it. Or, alternatively, remove the code that's causing the loop too long. Save the form.xml file, and then put it back into the .zip file, overwrite the old one. Change the .zip back to a .pp7, and open it with PlanetPress. Your changes will take effect, and hopefully that will allow you to work in your template once more!
NOTE: I strongly recommend that you make a backup of the .pp7 file before trying this, because if you accidentally break the form.xml file, it could render your template unuseable.
Regards,
Raphaël Lalonde-Lefebvre