I'm going through an environment upgrade from 8.0.3 to LSF. Some of my users could not export reports as csvs like GL200. I opened a GSC which got me no where. I found that users that could export it had the Environment Form "rptgen" in the Develop category of the security class. I haven't dabbled enough with LSF 9.0 Security but I'd suggest granting access to this for your LSF 9.0 user.