# Troubleshooting

A file that is refused, or a 3D view that is slow or empty.

Updated 1 November 2026

- [Why was my file refused or not read?](https://ifcchecker.com/help/troubleshooting-file-refused/): Check takes IFC files in the STEP format and IDS 1.0 files.
- [Why is the 3D view slow or empty?](https://ifcchecker.com/help/troubleshooting-3d-view/): The 3D view needs a recent browser with graphics acceleration switched on.

[Workflows and help](https://ifcchecker.com/help/)