FS#2677 - Draw > Polyline > Draw Polyline: Adding arc segment broken for CE
Andrew,
As suspected ... 
Most probably not OS related.
Downloaded QCAD 3.32.3 and removed the 10 files to downgrade to a CE version.
Menu Draw .. Polyline .. Draw Polyline (PL)
Draw at least one straight segment.
Activate the ‘Arc with Radius’ option and no bulging segment with given Radius and Sweep can be added.
Reason:
Both DrawPolyline.js and DrawPolylinePro.js now rely on RArc.createTangential to construct the required Arc. Without the RArcProxy RArc.createTangential Line 169 is not executed and an invalid RArc shape is returned. Further not verified.
Regards,
CVH