(only the first page was there and it was very wide)
This sounds like you had it set to landscape layout rather than portrait. Make sure it is set to 'Portrait' and give it another try.
Oh, you are right, I don't know why I haven't noticed this. But even when set to proper orientation, a document printed with PDF Creator has the same problems with line thickness. So this is probably an issue with Apache OpenOffice/Libre Office not loading the .docx properly. Are there any tools which would let me change the page size of an existing .pdf? This way I could do everything without OpenOffice.
Edit: Or is there some text editor that's more compatible with MS Word than Apache OpenOffice (and which doesn't have any limit on custom page size)?
Edit 2: Opening the document with Apache OpenOffice, removing all lines, and adding them again seems to resolve the problem with wrong line thickness in the generated .pdf. So if everything else fails, I think I'll just write a macro in OpenOffice which would do this automatically. But from what I've seen the OpenOffice macros are really messy, so I'd rather find a clearer and more pleasant solution.
Edited by Nukon, 18 September 2017 - 09:50 AM.