I have done a fresh installation in another machine. I have transferred there the .manager files. I have left the language in English. I opened the database (by double-clicking upon it) and found the demo invoice.
I tried everything once again. PDF and EMAIL buttons produce the correct invoice printout, but the PRINT button produces the erroneous one, same as previous.
No virtual printers exist at the new machine, so I have produced only printed invoice.
Now, you say that PRINT button process is not controlled by manager application? What controls it? It is obvious that there is a different program called when pushed the PDF and EMAIL buttons and a different when pushed the PRINT button
I have a suggestion to make: Since this produces different results, try to call the same program that produces the PDF file and then send this pdf to the printer. If I had the source code, I might be able to help more.
So my work-around is to make the PRINT button obsolete and use only the PDF button and then print the produced PDF until the bug is fixed (because it is definitely a bug), except if you have any other suggestion to make.
I would appreciate your advice, if there is a visual editor for liquid form language.