Hi
It appears that an animation bug has been introduced in 2019 SP1 of kendo ui jquery.
With the latest version, the animation for a context menu does not appear on the first call of .open()
Subsequent calls to .open() render the correct animation.
Dojo #1 shows the animation working first click
http://dojo.telerik.com/UJawAnAH
Dojo #2 shows the animation not working on the first click
http://dojo.telerik.com/oNerIDAQ
Regards