I've got an installation with SC 3.5 on SAP with MaxDB. I've two schedules, one for hourly and one for daily. Both are running fine without any problems. I can list the created Snaps under Data => SnapShots.
When I try to restore the DB with the wizard I can choose the FAS, the volume and the policy, but no snaps are listed.
I think the problem is that you are choosing the wrong policy. You can have policy of hourly, daily, weekly, monthly and when you do restore you have to choose the correct policy. This is only thing I can think of as to why you would see no snapshots in GUI.