Safari - webprocess wants to sign using key

Hi,

I am unable to browse certain encrypted sites because "Webprocess wants to sign using key "Apple something"...". I can accept, always accept or deny this. No matter which option I chose the web page cannot be displayed. I am running OSX 10.8.2 with Safari 6.0.1.

Some links as examples:

https://abo.zgk.de/sap/bc/gui/sap/its/media/jkwww05?RJKWWW_CHECK-NAME2=1&KEY_COM PL=1&~theme=70

or the login to the SAP support community: http://scn.sap.com/login.jspa

Does anyone else have this problem? Is there any solution for this?

Thanks

Holger