Why do PDFs with forms create black bars on some pages?
The only viable solution I've found so far:
- Upload PDF file with wrong fields to https://www.pdfescape.com
- Fill in any field, without at least one change to the fields, the uploaded file will be returned directly as is rather than recreated properly at point 3.
- Click on 'Save & Download PDF...' and download it onto your computer
The black form fields should now look normal. Whatever is wrong with them, rewriting the file completely with PDFescape seems to fix it.
Who knows what's wrong with them. Maybe Wizards of the Coast use some outdated Windows-only writer or something. Though strange that only the 'Character details' & 'Spellcasting sheet' pages are rendered wrongly...