I am having the same problem, and more. I recently installed Version 7, and am now trying to make my first graphic. I am having a terrible time.
* Most of the time an item will not select. Or, it will select an item that might be an inch away.
* Frequently, I select an item and start moving it (after I get the move icon), but a different, nearby item moves. Or, nothing moves.
* Sometimes I have given up moving an item and try to delete it, but I cannot select it.
* Some items I cannot color. They do not respond at all.
* Many actions are extremely slow. It might take 10+ seconds for an action to occur, or for an item to be selected, deselected, etc.
I can run Version 6.8 and it seems fine, although it has limitations on what I want to do.
I am running a Mac with OSX 10.11.6