Hi Rene!
Please kindly find logs bottomly(all log after trying "login media" button). Must admit that all needed parameters and configurations are valid and mentioned correctly...:
[u]Siebel SComm Log[/u]  (all log after trying "login to Multimedia" button):
SComm[08/02/2010 08:50:50:948]:DEBUG:Identify the driver for action, driver profile=Gplus OpenMediaGplus54, profile ID=1-84EM2, channel string=, media type=, command=OpenMediaLogin, event=
SComm[08/02/2010 08:50:50:948]:DEBUG:( Service Proxy Handle: 151402432 ) Begin: CSCDServiceProxy::InvokeCommand
SComm[08/02/2010 08:50:51:432]:DEBUG:( Service Proxy Handle: 151402432 ) End: CSCDServiceProxy::InvokeCommand
SComm[08/02/2010 08:50:51:432]:ERROR:Failed on invoking driver command(OpenMediaLogin), at driver(GenCommDrv), string-param(), parameter = 
WorkbinPlaceGroupId = 
WorkbinAgentId = AG_3
WorkbinAgentGroupId = 
SiebelViewBmk =  
WorkbinPlaceId = 
, driver error=1011
SComm[08/02/2010 08:50:51:432]:DEBUG:CSCDClientProxy Handle: 151439688 AddRef is called.  Now m_nRefCount is 2
SComm[08/02/2010 08:50:51:432]:DEBUG:CSCDClientProxy Handle: 151439688 Begin calling function : CSCDClientProxy::SCCLNT_BeginBatch
SComm[08/02/2010 08:50:51:432]:DEBUG:CSCDClientProxy Handle: 151439688 End calling function : CSCDClientProxy::SCCLNT_BeginBatch
SComm[08/02/2010 08:50:51:432]:DEBUG:CSCDClientProxy Handle: 151439688 Release is called.  Now m_nRefCount is 1
SComm[08/02/2010 08:50:51:432]:DEBUG:CSCDClientProxy Handle: 151439688 AddRef is called.  Now m_nRefCount is 2
SComm[08/02/2010 08:50:51:432]:DEBUG:CSCDClientProxy Handle: 151439688 Begin calling function : CSCDClientProxy::SCCLNT_HandleError
SComm[08/02/2010 08:50:51:432]:DEBUG:CSCDClientProxy Handle: 151439688 End calling function : CSCDClientProxy::SCCLNT_HandleError
SComm[08/02/2010 08:50:51:432]:DEBUG:CSCDClientProxy Handle: 151439688 Release is called.  Now m_nRefCount is 1
SComm[08/02/2010 08:50:51:432]:DEBUG:CSCDClientProxy Handle: 151439688 AddRef is called.  Now m_nRefCount is 2
SComm[08/02/2010 08:50:51:432]:DEBUG:CSCDClientProxy Handle: 151439688 Begin calling function : CSCDClientProxy::SCCLNT_EndBatch
SComm[08/02/2010 08:50:51:432]:DEBUG:Successfully send batch notification from driver(Gplus OpenMediaGplus54) to AG_3
SComm[08/02/2010 08:50:51:432]:DEBUG:CSCDClientProxy Handle: 151439688 End calling function : CSCDClientProxy::SCCLNT_EndBatch
SComm[08/02/2010 08:50:51:432]:DEBUG:CSCDClientProxy Handle: 151439688 Release is called.  Now m_nRefCount is 1
AG_3_52432[08/02/2010 08:50:51:432]:DEBUG:Start processing async SRM event for user AG_3, key = 3fc|4c5678c2|0, method = PostBatchSCMessage, message = 
Method = PostBatchSCMessage
  Child property set, type =  { 
Method = HandleError
ProfileID = 1-84EM2
DriverTrackID = 
Error = [b]Unknown place specified in request[/b]    
 } 
SComm[08/02/2010 08:50:51:588]:ERROR:Error on invoke media manager method(InvokeCommand), input args={ 
DriverProfileID = 1-84EM2
StringParam = 
DataSet = 2#96#5#19#WorkbinPlaceGroupId14#WorkbinAgentId19#WorkbinAgentGroupId13#SiebelViewBmk14#WorkbinPlaceId17#5#0#4#AG_30#1# 0#
DeviceCommand = OpenMediaLogin
AttachContext = 0
}, error=36187), msg='Failed on invoking driver command(OpenMediaLogin) at driver GenCommDrv, driver error = 1011.(SBL-CSR-00505)'
SComm[08/02/2010 08:50:51:588]:DEBUG:End invoking media manager method(InvokeCommand)
SComm[08/02/2010 08:50:51:588]:ERROR:Failed to invoke method(InvokeCommand) at media manager, detail error = Failed on invoking driver command(OpenMediaLogin) at driver GenCommDrv, driver error = 1011.(SBL-CSR-00505)
AG_3_52432[08/02/2010 08:50:51:588]:ERROR:Communication Agent failed on prcoessing request(InvokeCommand0, input-args={
DriverProfileID = 1-84EM2
StringParam = 
DataSet = 2#96#5#19#WorkbinPlaceGroupId14#WorkbinAgentId19#WorkbinAgentGroupId13#SiebelViewBmk14#WorkbinPlaceId17#5#0#4#AG_30#1# 0#
DeviceCommand = OpenMediaLogin
AttachContext = 0
}, errcode(36187), errmsg(Failed on invoking driver command(OpenMediaLogin) at driver GenCommDrv, driver error = 1011.(SBL-CSR-00505))
AG_3_52432[08/02/2010 08:50:51:588]:ERROR:Failed on invoking InvokeCommand in Comm. Server Svc., err=36187, msg=Failed on invoking driver command(OpenMediaLogin) at driver GenCommDrv, driver error = 1011.(SBL-CSR-00505), input= DriverProfileID = 1-84EM2
StringParam = 
DataSet = 2#96#5#19#WorkbinPlaceGroupId14#WorkbinAgentId19#WorkbinAgentGroupId13#SiebelViewBmk14#WorkbinPlaceId17#5#0#4#AG_30#1# 0#
DeviceCommand = OpenMediaLogin
AttachContext = 0
AG_3_52432[08/02/2010 08:50:51:588]:DEBUG:End invoking InvokeCommand in Comm. Server Svc.
AG_3_52432[08/02/2010 08:50:51:588]:ERROR:Invoking user command(LoginToOpenMedia), input args {SWECmd = HTML Comm LoginToOpenMedia
FocusBusComp = 
SWERPC = 1
Command = #39
Method Argument = 
Work Edit_HasFocus = false
SWEC = 4
Work Edit = 
SelectedText = 
}, err=36187, msg=Failed on invoking driver command(OpenMediaLogin) at driver GenCommDrv, driver error = 1011.(SBL-CSR-00505)
AG_3_52432[08/02/2010 08:50:52:994]:DEBUG:End invoking communication Command(LoginToOpenMedia), err =19164
AG_3_52432[08/02/2010 08:50:52:994]:DEBUG:End invoking LoginToOpenMedia in Comm. Client Svc., err = 19164
AG_3_52432[08/02/2010 08:50:52:994]:ERROR:Failed on invoking LoginToOpenMedia in Comm. Client Svc., err=19164, msg=Communication: Failed to invoke command 'LoginToOpenMedia', detailed error = 'Failed on invoking driver command(OpenMediaLogin) at driver GenCommDrv, driver error = 1011.(SBL-CSR-00505)'(SBL-CSR-00111), input= SWECmd = HTML Comm LoginToOpenMedia
FocusBusComp = 
SWERPC = 1
Command = #39
Method Argument = 
Work Edit_HasFocus = false
SWEC = 4
Work Edit = 
SelectedText = 
AG_3_52432[08/02/2010 08:50:52:994]:DEBUG:About to push message to browser, message=<command name="ShowErrorStatusText" value="Communication: Failed to invoke command 'LoginToOpenMedia', detailed error = 'Failed on invoking driver command(OpenMediaLogin) at driver GenCommDrv, driver error = 1011.(SBL-CSR-00505)'(SBL-CSR-00111)" />
[b]GenComm Driver[/b]
----------------------------->
10:50:50.515 Trc 25030 [   552] (         Service.cpp: 258)  InvokeCommand: 097ECAC8296C05C6, OpenMediaLogin, trackingID 
10:50:50.515 Dbg 15031 X Enter Service(00c0e850).Invoke
Service(00C0E850){
    ISC_SERVICE_HANDLE=00000001
    CALLBACK_HANDLE=00AC7C80
    CALLBACK_ENABLED=1
    REF_COUNT=3
    DISABLED=0
    SERVICE_STATUS=2
    CURRENT THREAD=552
}
10:50:50.515 Trc 04542 Message request_agent_login sent to 392 (Interaction Server 'Interaction Server')
	attr_prxy_client_id [int] = 12
	attr_ref_id [int] = 3
	attr_reason [int] = 0
	attr_place_id [str] = ""
	attr_tenant_id [int] = 101
	attr_agent_id [str] = "AG_3"
	attr_reason [int] = 0
	attr_media_list [bstr] = TKVList:
	   'email' [int] = 0
	   'chat' [int] = 0
	   'SiebelEmail' [int] = 0
	   'BackgroundEmail' [int] = 0
	attr_donot_disturb [int] = 0
10:50:50.734 Trc 04541 Message event_error received from 392 (Interaction Server 'Interaction Server')
	attr_prxy_client_id [int] = 12
	attr_ref_id [int] = 3
	attr_error_code [int] = 9
	attr_error_desc [str] = "Unknown place specified in request"
As I understood parameter 	[b]attr_place_id [str] = ""[/b] did not "catch"... but why? all parameters are properly determined in config...