Create Snapshot -&&> FAILED! You Dont Have Sufficient Permission To Run This Command

Hi all,

i'm trying to create a publication and its snapshot in the default snapshot folder of MS SQL Server 2005.
It's all done by RMO.

Following Scenario:
1. PublicationDB was created by User1(sysadmin) ... successful
2. Enable PublicationDB for Publishing ... successful

2. Creating the publication: executed as User2(db_owner)
2.1 publication.Create(); ... successful

2.2 publication.CreateSnapshotAgent(); ... successful
2.3 Add Articles to publication ... successful
2.4 Generate Snapshot with

agent = new SnapshotGenerationAgent(); and setting all parameters for it, then execute by

agent.GenerateSnapshot();

And at this point,i got an error message, because the snapshot agent cant be executed ...

2007-09-12 12:05:46.58 User-specified agent parameter values:2007-09-12 12:05:46.58 --------------------------------------2007-09-12 12:05:46.60 -Publisher EDOM04SQLstandard2007-09-12 12:05:46.60 -PublisherDB TMS4X_PublicationDB2007-09-12 12:05:46.60 -Publication TMS4X_PublicationTest2007-09-12 12:05:46.60 -ReplicationType 22007-09-12 12:05:46.60 -Distributor EDOM04SQLstandard2007-09-12 12:05:46.60 -DistributorSecurityMode 12007-09-12 12:05:46.60 -PublisherSecurityMode 12007-09-12 12:05:46.60 --------------------------------------2007-09-12 12:05:46.63 Connecting to Distributor 'EDOM04SQLstandard'2007-09-12 12:05:46.96 The replication agent had encountered an exception.2007-09-12 12:05:46.96 Source: Replication2007-09-12 12:05:46.96 Exception Type: Microsoft.SqlServer.Replication.ReplicationAgentSqlException2007-09-12 12:05:46.96 Exception Message: You do not have sufficient permission to run this command. Contact your system administrator.2007-09-12 12:05:46.96 Message Code: 142602007-09-12 12:05:46.96

Configurations:
-All Users have rights for read and write on the snapshotfolder including the Agent
-All users are defined in the same windows domain
-the snapshotagent account has sysadmin rights on the server and is assigned to the predefined MS SQL User Role

This scenario is workin completely fine when i exceute everything as a "sysadmin"!
But when executing it all as "db_owner" of the database, its not workin!!!

Does anybody has any resolutions for this problem?
I appreciate any support.
MariJo