Rhino 7 seems to have an issue with the dashed lines units. I have Finnish localization in my windows (using comma instead of a dot). Rhino displays default linetypes as seen in the screenshot and they work fine. But when I try to add custom dashed lines and click OK Rhino does not save my lines. I believe this has to do with some confusion with commas marking different things simultaneously (fractions, separations).
@esa.ruskeepaa this should be fixed in version 7 SR4. If you haven’t updated your Rhino 7 lately then please do an update and let me know if you’re still seeing this issue.
You’ll need to set Options > Updates and statistics page > Update frequency to ‘Service Release Candidate’.