Сontent is duplicated twice

do you have multiple elements with the class ‘Print_new’?
Regardless, you should try the latest RC of the next version:
https://github.com/baden03/print-o-matic/tree/2.0-redo

It might resolved some other issues for you.

thanks for the quick reply ?? installing the new version helped

Can you tell me if I can display the hidden block? The thing is, when I add to the block display: none; then it is not displayed on the print version either … This worked in the previous version

yes.
the new version uses the power of:

@media print {
}

so, if you had an element called .printonly
you just need to override it’s print-only css like so:

@media print {
   .printonly {
      display: block;
   }
}