I use the harmony 14 trial since few days, I found a lot of problems,
for example when I use a brush I found it changed by its own !! i have to close the project and open it again, or sometimes i have to make a new project !!!
The brush turns to be a lens after I made undo !! I have to go out the harmony then go back to it again, to have the brush again !!!
It could be your system acting up because the graphic card ran out of resources.
Contact support to have a look on your computer.