When Jaspersoft is installed, it creates a default organization named 'Organization'.
After Clarity PPM has been configured, a second organization is created named according to that specified in NSA, for example PPM.
It is necessary to delete Jaspersoft's default organization in order to:
1. Remove the organization prompt from the Jaspersoft login screen.
2. Allow developers (non-Clarity users), who have been created in the PPM organization, to log in to Jaspersoft
3. Allow developers to connect from Jaspersoft Studio to Jasper via a JasperReports Server Connection.
I hope that helps anyone coming across this problem.