Layer won't unlock for 32 bit image in CS4

I'm running Photoshop CS4 11.0.1 on Windows XP SP3. When I generate a 32 bit image from FILE > AUTOMATE > MERGE TO HDR, the resulting image has a single layer that cannot be unlocked. Consequently, when converting to 16 bit, I can't manually adjust the sliders in the Toning Curve & Histogram area of the HDR Conversion dialog box. What am I missing?

Ah, that's why I've been pulling my hair out! Thanks for preventing me from losing any more, Chris. I'm not using Extended, so that explains it. I did find the sliders, and they were helpful.

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