Student using HDR first time - image very red, ok after update ONCE, then red again

I hate to ask in a room full of pros, but here we go. Using WIN7 64 bit
Purchased CS6 and takiing first class. CS6 ver 13.0.1 64 bit.
We are learning about HDR. We have been provided 3 dng images of a model (a young lady) to work with.
I have done the same thing four times and the opening image is darker with a lot of red.
File_Automate_Merge to HDR Pro
I select the tree images (they all look nice)
Make sure the "Attempt to Automatically Align Source Images box is checked"
Click OK
PS makes layers, one being a merge to HDR pro layer
Arrgghhh. I just installed the update (I was using 13.0 64 bit) just before posting this and was going through the motions as I typed in here and...... the image opened perfectly and I was able to do the lesson. However, I tried to do it  a second time, just to make sure...it is very red again. Any help please?

Your video cards display is usually 16, 24 or 32 bits total. The settings used in photoshop are for each channel.
There are 3 channels for the monitor Red, Green and Blue. Each having 8 bits or 8+8+8= 24 bits or 16777216 colors as there are 256 color per channel and 256 3rd power is 16,777,216.
So a 32 bit video card would be 256 to the 4th power.
Now back to photoshop, 16 bits per channel is 512 colors per channel or 512 to the 3rd power or 134,217,728 colors
Therefore 32 bits per channel would have 1024 colors per channel or a total of 1,073,741,824.
Keep in mind for this example I only used the RGB channels, photoshop is capable of creating multiple channels, granted these extra channels are primarily used for tansparency, masks, and selections. But in theory one day these extra channels could be used to display extra color information on the screen along with the main RGB channels.
To prove this, just switch to CMYK, that mode is displaying 4 channels instead of 3 on the screen. So who's to say that one day someone will create a new color mode that all monitors will adopt as a standard? Photoshop is ready and waiting, most of the coding is already done.
Anyway I am getting off subject a bit, so I better stop...

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