same problem here. I excluded old hosts from the Monitor and cleaned the object from the reporter databse but the reporter ist still giving me the warning. Also another collection job for Veeam B&R is giving me an error:
18.12.2015 14:30:14 [info]: Initializing data collector
18.12.2015 14:30:14 [info]: Initializing connection
18.12.2015 14:30:14 [error]: Veeam ONE free edition supports Veeam Cloud Connect only. If you want to add full version of Veeam Backup & Replication, please use paid edition of Veeam ONE.
18.12.2015 14:30:14 [info]: srv-w2k8-admin: Data collection completed
18.12.2015 14:30:14 [info]: Data collection completed for all objects.
18.12.2015 14:30:14 [error]: Collection has failed. Performing rollback to the previous session state...
18.12.2015 14:30:14 [info]: Rollback to the previous session state has been completed.
First I thought my problems are caused by changing the adminstrators password of the windows server, but I changed it in every veeam service where i could found credentials for the windows server.
Also the veeam B&R and veeam ONE(after exlduing the old hosts from monitoring) got a valid full license and is working fine in the veeam Monitor. So I think the reporters first warning is causing the problems.