This will be pretty much impossible for the developers to diagnose and cure without the culprit STEP file or a stripped down example that displays the issue.
This looks to be a curve issue, not a “STEP 242 annotation and symbols” issue like RH-60777. Specifically, the STEP file contains composite_curve and composite_curve_segment entities that may not be properly supported by Rhino’s STEP importer.
Thank you gentleman , is it possible to have this in Rhino 8 ? as test ?. I have seen you flagged this for Rhino 9 release .Just asking i created around Rhino 8 a whole CAD/CAM application .Sorry i cannot wait so long /switch all to Rhino 9 . I got 1000’s of test parts if needed …
Thank you Al