Some PDF files will not open in LO Draw

I cannot open about 10-15% of PDF files with LO Draw and I cannot figure out why or when it will happen. I could attached samples to illustrate the problem. These files can be opened in every other application, including browsers, but LO Draw will only show an “input/output error” when trying to open them. Can anyone figure out why?

In order to be able to help you as quickly as possible, we need to know your operating system and the LibreOffice version (three digits, e.g. 7.3.2).

All important information about your initial question should be present in the initial question box, otherwise edit and complete it., to do it.

Please do not use answers (solutions) or comments for this.

If you have already fulfilled some of these requirements, so much the better. Thanks.

Upload a reduced and anonymized file here so that someone can examine it.

Here you can find the further References for this page.

Thank you very much for your assistance.

At moment only the person(s) with access to your 10%-files… So upload some (start with a smaller file) or buy some books on postscript or pdf-internals.