For those using Internet Explorer, especially older versions, there's been a bug in the new version of the tools that can cause the photos to not display correctly, instead persistently showing a black screen.
We just released a patch meant to address this issue for Internet Explorer. You may need to clear your cache and refresh your browser in order to get the fix.
A second patch that will remove the dialogue box that hides the image while the tools are paused, add better control over what types of images you want to draw, and a few other convenience updates is in the works; I'm anticipating its release before the month is out.
Thanks to everyone who has reported issues and come to me with suggestions for improvement!