Every Scale option I select in the OpenShift Explorer view show this error:

Unable to scale guestbook-service
Exception trying to PUT https://10.1.2.2:8443/api/v1/namespaces/sample-project/replicationcontrollers/guestbook-service-2 response code: 409 Operation cannot be fulfilled on replicationcontrollers "guestbook-service-2": the object has been modified; please apply your changes to the latest version and try again

However, the scale command is executed successfuly.

Steps to reproduce:

1. ASSERT: make sure that you have a service with at least 1 pod running in OpenShift
2. EXEC: in OpenShift Explorer: select your service and pick "Scale > To" in the context menu
3. ASSERT: "Scale Deployment" dialog is shown, prefilled with the current number of replicas
4. EXEC: change the replicas to a high number (ex. 6 is working well for me to cause the error)
5. ASSERT: you get the error, if not process with next step
6. EXEC: in OpenShift Explorer: select your service and pick "Scale > To" in the context menu and scale down to "1" replica

Result:
either you now get the error above or you need to scale back up etc.