Comment 1 for bug 1239682

Not reproduced with r12687 on OS X 10.7.5 using default (new) prefs, a new document based on the default template (for locale 'en_US'): independent of whether the default units are changed to 'mm' (in 'File > Document Properties > Page') or only the units on the controls bar of the Select tool and the Rectangle tool: the rounded corner radius displayed on the controls bar of the rectangle tool reflects the value correctly in mm.

Test object drawn after changing the units: 50 x 50 mm, corner radius Ry 10mm

Could you attach a sample SVG file which exposes the reported issue, or provide detailed steps how to reproduce such a situation from scratch?