I've tried a few combinations:
- Opening an Excel-generated xlsx file results in a spreadsheet with the correct name, but no content
- Opening a LibreOffice-generated xlsx file results in a spreadsheet with the correct name, but no content
- Importing an Excel-generated xlsx file results in a spreadsheet called Spreadsheet with some garbage characters
- Importing a LibreOffice-generated xlsx file results in a spreadsheet called Spreadsheet with no content
I've attached basic_specs.xlsx (LibreOffice-generated) and basic_specs_excel.xlsx (Excel-generated) in case anyone wants to experiment.
My search also led me to https://www.freecadweb.org/tracker/view.php?id=2737 , but that issue was closed as fixed sometime in 2016.
I've also encountered a forum thread somewhere advising someone to get rid of system.cfg and user.cfg, so I did that as well without noticeable results.
There are no non-unicode characters in any of the paths involved (/home/erik and /home/erik/Downloads).
Linux FreeCAD information:
OS: Ubuntu 18.04.1 LTS
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Build type: Release
Python version: 3.6.8
Qt version: 5.9.5
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: English/UnitedStates (en_US)
Where do I go from here? File a bug report? Is there something else I can try? Something I can do to help figure out what the problem is? My first guess would be I'm missing a library somewhere, but I have no idea which one.