Does it also happen often that you are scrolling sideways in TinkerList and suddenly you leave the platform and Chrome goes back to a previous web page?
Suddenly this arrow appears and you are 'thrown out' of the project.
This can be solved easily by changing your track pad settings if you have a MacBook.
Go to System Preferences
Find the Trackpad settings
Check the gesture settings in 'More Gestures' for 'Swipe between pages'. If it says 'Scroll left or right with two fingers', you should change it or disable it by unchecking the box.
You can still scroll left and right in TinkerList, but you won't get the arrow anymore that directs you to the previous page. Fixed!