> For the complete documentation index, see [llms.txt](https://groundhoglighting.gitbook.io/groundhog-bible/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://groundhoglighting.gitbook.io/groundhog-bible/appendixes/known-issues.md).

# Known issues

## Exporting problems

* Copying and pasting windows, walls, workplanes or any surface with a name will end in repeated names... that causes errors when exporting.
* TILT field in IES files (for exporting luminaires) does not work.

## Simulation problems

* Radiance multithreading is not supported on Windows
* Some windows users have had trouble assigning the Radiance path. I have been told that was solved as follows:
  1. Go to 'Control Panel' > 'System' > 'Advanced' > 'Environmental Variables' and check if the Radiance PATH is correct. If not, fix it.
  2. Then input the PATH in the Groundhog Preferences menu as follows: **C:/Program Files (x86)/Radiance/bin**, that is, with "/" (not "\\") and without adding any program name.

## Creating materials problems