The faultless display of the PDF forms on our site can only be guaranteed when using Adobe Reader. Opening the PDF forms with other PDF readers or browser plug-ins can cause error messages and display problems.
Alternatively, it may be helpful to first save the document to the hard disk and open it from there. To do this, right-click on the link and select "Save target as", or a similar button depending on which browser you use.
Firefox 19 and newer versions have an internal PDF viewer, which is enabled by default. This cannot display all forms correctly.
In order to be able to display the PDF files again in Firefox with Adobe Reader, one of the two settings [PNG] (160 KB) must be selected.