Cassandra will not Move!

Hi, I just started a new game and have encountered a bug. In the opening sequence when my hero tries to shut down the final rift Cassandra is immobile. She wont move in tactical mode or non tactical mode. If I order her to attack she will not budge. Its like she is frozen. I ignored it in the beginning since all I wanted to do was advance the story. However, I just started my first quest outside of the camp, the Hinterlands I think, and in the initial battle the same problem has presented itself, Cassandra wont move. I started the sequence over and took control of Cassandra, she moves but now the main character wont move. Has anyone had a similar experience? I am on PC OS Win7 Amd 8350 fx processor and Amd RX 570 graphics card. Its an older system but well within the specs to run the game.