OsmAnd version: 3.4.1
driving region setting: Europa, Asia, latin Amerrica and similar (right hand driving)
The roundabouts should be taken anti-clockwise.
I draw a gpx-file (attached) on the map (lichtblue)
I let OsmAnd navigate this gpx-file with the option "Calculate route between points" (darkblue)
In the attached image you can see a roundabout (in Wezep, Netherlands) with the oriinal lichtblue track (anti-clockwise) and the calculated darkblue track (clockwise).
There are other wrong navigated roundabouts on this trackbut there also are roundabouts that are navigated correctly.