I open the latest version of Photoshop CS6 64 bits, with the latest version of ACR, using Windows 7. I select 3 raw files (CR2) in Bridge, right click on them, and click on NIK Software. I then click on Merge to NIK HDR Efex Pro, tell the NIK dialogue box to align and de-ghost the images, and watch the three images come up in CS6. Then I watch the info box as NIK tells me it is aligning the images. When that finishes, I get an error message, "The Command HDR Efex Pro is not currently available."
I have the latest version of NIK HDR, and just to make sure I uninstalled it, re-downloaded the latest version, and reinstalled it. The result was identical.
If I simply open the images in ACR and then open them in CS6, I can access NIK HDR Efex Pro through Filters>NIK Software>HDR Efex Pro, and they will get combined and NIK HDR will open the way it is supposed to.
Has anybody else experienced this problem opening RAW files from Bridge in NIK HDR Efex Pro?