Hi,
To see the keyframes of any layer or operator such as a mask just select it in the workspace panel and the keys associated with it will be shown in the timeline. You can also navigate through your hierarchy with the triangle that points up above the scroll bar for the timeline and lastly yes there is a show animated only option it is found in the timeline options fly-out. It is the little triangle pointing to the right above the scroll bar for the timeline.
When you apply a mask the current viewport will be at the mask level so to see the combustion or any other level of your workspace turn on the compare option on the tool bar and then choose the composite as the compare source. The viewport will be showing you a split view of the composite and the mask level. Click and drag in the viewport so you only see the composite.
If you want to perform a operation to only certain pixels do not use a masks use selections. Apply a draw selection prior to the operator and you can isolate what ever you want. Since the draw selection is a vector object make sure to apply a remove selection above the operator so the selection is removed in the hierarchy if needed.
There are some very big differences from A/E and combustions workflow so I highly recommend you spend some time with the manual. But of course your questions will always be welcome and we are here to help.
Later
Ken LaRue
combustion application engineer
http://www.thestreetproductions.com 
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