In MX the KF slider range right hand edge is no longer exactly aligned with the time slider. These two screenshots comparing MX and MEP17make it clear.
http://dl.dropbox.com/u/4019461/MX-KF-RH.jpg
http://dl.dropbox.com/u/4019461/MEP17-KF-RH.jpg
So, when preparing to place the RH KF either with the End key or by dragging quickly to the right and beyond, the resultant KF is no longer visible. You can just see a tiny part of it in my screenshot. Accessing it is then a pain. And at times, when changing the duration so as to make the RH KF visible again, the LH KF disappears.
Edit: This is more complicated than it first seemed. The extra bit on the RH end of the time range only appears if the object has been selected when no other objects are already selected. Such as by clicking in an empty track first. If an object X is already selected and I then click the target object on which I want to work with KFs, the flaw disappears, i.e. both ranges are identical.
--
Terry, East Grinstead, UK