Tooltip doesnt exit

I am currently facing issues with tool-tips on perspective. The tooltip has been created as a configured even/MouseEnter displaying a label with the name of the component. This was created in V.8.0.6. Now that the project is running under 8.0.15 the Mouse Enter event seems to be staying on the screen without exiting from the MouseLeave event which closes the pop up. Any ideas would be much appreciated.