Kris,
Your first issue sounds odd. The process that displays SWG user pages is the same for all, so the inability to display one page but not another is unexpected behavior. I would recommend contacting Support so we can try and troubleshoot the issue with you.
Regarding the second question - You should be able to easily remove users from Quarantine by accessing the Quarantine sub-report from the Infected Clients report. This report will show a list of users that are Quarantined which can then be removed by checking the boxes and selecting 'Remove Selected Clients from Quarantine'.
Lastly - there were legacy features from the company that Symantec acquired (Mi5 Networks) that contained some Client Remediation options. Symantec is looking at enhancing and reintroducing these features in future releases of SWG.
SI