I have a similar problem. I am an IT analyst and after the update, a client's laptop touchpad freezes after using the Markups. The difference that I can see is that Word now has balloons instead of just the markups in the righthand column.
I have tried a number of things - even went so far as to rebuild the device and adjust the settings so the balloons would not display, but alas the track changes and markup seem not to display as they should since the June 8 update.
I don't necessarily want to remove the updates, but I will try to remove all June 8 updates to see if that does the trick. I just thought this may be helpful to isolate the issue as the trackpad only stops working for us when using the above feature. In the past I don't recall balloons appearing - only text off to the side. The end user is used to the right-side markups and was too much of a change to use the review pane and it also didn't show exactly where the changes were....