I cannot replicate this bug, so I’m really just posting this to see if anyone else has experienced it and has a fix!
Sometimes when I have items selected I cannot de-select them very easily. If I click on a blank space in the mockup it does not de-select the item.
I noticed this had been reported before in May, but this was reported fixed after an update. However, I’m using the latest version and am still seeing this bug.
I’m running Windows 7, and it could be this is related to an issue in Windows where a keyboard key is thought to be held down by the OS, even though it’s not. But that’s only a guess.
To be clear this is not constant, and restarting Mockups 3 fixes it.