Can anyone please advise why Cad freezing up when selecting annotative object scale

Probably too many annotation scales - try to purge the excessive scales. Seehttps://www.cadforum.cz/cadforum_en/qaID.asp?tip=3649

You need to update the CAD and also check the framework of your windows where you will be asked for the framework updation. For more information visit  http://netgears.support/netgear-genie-support