**System Information**
win 7 pro 64bit 8GB ram
**Blender Version**
Broken: 2.70 b66a954
Worked: (optional)
When you add additional Mask Layers in the Mask tool (UV Image editor or MCE), any keyframes created only appear in Dope Editor for the first layer.
This means you can't alter the keyframes of other mask layers.
steps:
Make a new mask
Make a new mask layer and add a mask shape.
Create a keyframe - move in time create another keyframe - keyframe appears in Dope Sheet
Make a new mask layer and add a new mask shape there
Create a keyframe - move in time create another keyframe - no more keyframes appear in Dope sheet.
.blend attached. Disregard VSE strips, look at the Dope Sheet. There should be keyframes on every Mask Layer.
{F93641}