Every project thumbnail is black in Davinci Resolve

Hello everyone, this is my very first post here.

I'm using resolve 11 on a Mac and every thumbnail of my projects is black.
If I hover my mouse on a thumbnail and move it left or right, suddenly a single frame will appear, but then again it will go back to black.

This is getting annoying because I'm starting to have many different projects.
Any idea on how to solve this?

[Peter Chamberlain]

HI, please detail the hardware and OD details of your system. Which GPU? etc? Which drive have you set as your scratch disk in preferences? Is this where your clips are? How is the drive connected to the computer.

HI, please detail the hardware and OD details of your system. Which GPU? etc? Which drive have you set as your scratch disk in preferences? Is this where your clips are? How is the drive connected to the computer.

Hi, thanks for your reply!

I'm working on a unibody MBP, non retina, but the slightly higher resolution one.
OS X 10.9.3
CPU: i7 2.2 GHz
GPU: AMD Radeon HD 6750M (always on)

I'm working on a single, internal, SSD hard drive which contains all of the clips.

I know it's not an optimal setup, but it's all I can afford at the moment