Viaccess SC init fails after restart of oscam

When I start oscam with a Viaccess SC at the first time, the SC init works fine. But after restarting oscam the following error occurs:

2009/07/01 19:05:57 16711 r02 card detected 2009/07/01 19:06:02 16711 r02 ATR: 3F 77 18 00 00 C2 3F 77 18 00 00 C2 2009/07/01 19:06:03 16711 r02 card system not supported 2009/07/01 19:06:03 16711 r02 card initializing error

I have to reboot the Ubuntu 9.10 system, to get the Viaccess SC working again.

This only occurs with Viaccess SCs, Conax and N3 works fine.