Suunto Ambit not working after upgrade to OS 10.9 / Safari 7.0

after upgrading to OS 10.9 and Safari 7.0 (9537.71) my Suunto Ambit watch and movescount.com does something strange.

1. the usb port on my monitor is not alwas connecting to the watch... the usb on the mac mini appears to be working correctly

2. cadence sensor, if paired the watch does not give any distance or speed shown at 0.0.... if not paired both distance and speed works as it should!

Software on watch or Movescount is not changed. The day day before I upgraded to OS10.9 and safari 7 everything worrked fine