PDF files are opened directly in your browser
By default Adobe reader is setup to open PDF-files from the internet within the browser. In some cases this may be the reason why you cannot show or save an invoice on your pc.
How to prevent PDF files from being shown within your browser
You remove this default setting the following way:
- Open Adobe Reader, select "Edit" and "Preferences" in the top menu
- Select "internet" and uncheck the box "Display PDF in browser"
- Click "ok"

