Today, when I attempt to stack images I get:
Unable to load DLL 'PhotLib.dll': The specified module could not be found. (Exception from HRESULT: 0x8007007E)
I have the same problem attempting to stack images from any telesope system in any filter. I have no problem loading and doing the photometry on any individual image..
Work-around which works for most users (mentioned previously):
1.- first open an image
2.- go back to image list
3. - then select images to stack and click stack
Does this work for you? Your last sentence may imply NO? Try in that order.
I had the same problem and Ken's work-around worked. The question is: Why should we have to employ a work-around? This did not seem to be a problem previously.
Almost certainly resulted from porting the VPhot system to a x64 bit OS last year for security. Haven't spent the time to find a fix. Some day!?