When viewing a trace in the simulator and observing a state in which a delay takes place, only the values of the clocks at the end of the delay are shown. When you look closely, you can see that the clock ranges are drawn first (in black), and immediately afterwards the end values are drawn over them (in blue).
When an enabled transition is selected in the simulator, only the valuations in which the transition is enabled are shown. This is indicated by blue. If no transition is selected, all valuations of the zone are shown (in which case the variables are shown in black). I believe this is described in the help system.
But when I select a state in the MSC, a transition is automatically selected in version 3.5.7. And I cannot unselect it. In version 3.4.11 clicking on a state in the MSC does not select a transition, thus showing the valuations in black (including the clock ranges).
Ok, this is an unfortunate behaviour. I will see if we can get the old behaviour back. BTW: You can unselect the currently selected transition by ctrl+clicking it in the list of enabled transitions.
Fixed on the trunk.