This errors at the start are normal for this first version (0.1) But it should not be producing black images, you are the second person with this problem. Can you check if you have all the read/write permissions on the folder?
I was originally getting permission errors when trying to save the image. I resolved that by adding exceptions (which worked), I even turned of my antivirus completely. The images get saved fine, it's just that they are uniform black. If anyone figures it out, please let us know.
Nope, no overclocking done. I tried some different settings of my video card to no avail. I also don't get any errors in the CMD window except for the normal ones at startup described by GRisk.