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OK, I just discovered that if you change the layer mask on an adjustment layer into a vector mask, you get the following.

If you have an adjustment layer..............like a Solid Color Fill adjustment layer..........

[ATTACH=full]90708[/ATTACH]

The Solid Color Fill layer has it's own layer mask when it's created, so you can only select a vector mask from the layer/vector mask icon located at he bottom of the layers panel.

[ATTACH=full]90711[/ATTACH]

So........if you have that layer selected, and you click on the layer/vector mask icon located at the bottom of the layers panel, you will get the following.

[ATTACH=full]90709[/ATTACH]

It turns the adjustment layers-layer mask into a vector mask, thus the shape layer icon and a path!

[ATTACH=full]90710[/ATTACH]

This is what you have probably done.