Divinci issues

thanks for allowing me to be in the forum. I am a fairly new divinci resolve user with my ursa mini pro and using 14. i downloaded the new software to my studio Mac Pro with 20 gig of ram, 3 gig of video ram and an 8 core mid 2010 chassis. when i loaded the software and opened it up, loaded a session from my local raid drive the clips came in black and blown out white. when i load the timeline the preview windows show the right clip in color etc until i hit play and then it disappears and the video is very choppy and eratic. I cannot use it to add audio or sound effects because its jumpy. i would think 20 gig of ram and 3 gig of video would play.
Similar issue with eratic nature on my new 2016 macbook pro, it gets eratic when audio is added rendering it useless to edit with. Help if you can.
Similar issue with eratic nature on my new 2016 macbook pro, it gets eratic when audio is added rendering it useless to edit with. Help if you can.