The five new Uprisings introduced with Game Update 5.1 are currently not available through Group Finder. In order to participate in these Uprisings, gather a group, accepted the Uprising Mission from the Combat section of either fleet, and travel to the Uprising when prompted. This will be fixed soon. Affected Uprisings:
Destroyer of Worlds
Divided We Fall
Trial and Error
Players who acquired Shae Vizla prior the Game Update 5.1 have had her weapon and customization unequipped. The equipment can be found in the player's inventory.