I have been using Qimage without problem for almost 10 years.  I have the pro edition.  Two days ago I did a standard print to file to convert PSD images to my local Costco icc profile.  About half the images ended up with a dull green color cast when viewed on my monitor.  They also printed that way.  Now here is the bizarre part.  When I simply open the psd files in Qimage, the images have the green cast. It doesn't matter what icc profile I am using.  In fact, I can turn the profiles off.  If I look at them in PS or with say Windows photo gallery they look as they should.  Certain images have the cast because of something that Qimage has begun to do a couple of days ago.  Which images have the cast seems to be random.  In my testing, some previously "off" pictures have "normalized" and other previously OK images acquired the cast.  I have done several resets with no luck.  I've gone back to earlier monitor calibrations and Costco icc profiles.  If I convert the files to the Costco profile in PS5, they look just fine.  I have an NEC monitor that I calibrate with Spectraview software.  I'm no expert, but I'm pretty familiar with how things work.  I've checked all current setting and tested earlier versions of all settings.   I've been trying to figure this out for two days. Still, I hope it's something stupid that I have done.   I have a big gallery show coming up and I need to make dozens of prints ASAP.  Can some one help me?

This just gets more screwy.  I work in prophoto color space.  I checked all the files in both NEF and PSD.  They are all tagged with prophoto.  When I open qimage, however, a few of them (the green ones) open up as srgb!   How can this be?  This seems to be the source of the problem. 

Thanks, I may be using the term "tagged" incorrectly.  According to my PS metadata all my images are in prophoto color space.

The icc override worked, but that would mean I would have to check every image I print manually (remember it appears to be happening on a random basis) and then apply the override filter.  There must be a way to prevent this to begin with. 

Set the Assigned profile to Prophoto in EDIT Assign color space in CS5. Place the dot in the row to use it.
Then SAVE.

You can see yourself narrowing in on the real cause....

Fred

I should have added that doing what you said works.  I am now painstakingly going through hundreds of images by opening the folders in Qimage, identifying which ones are listed as srgb (remember that PS lists all PSD files as Prophoto).  Every image that is listed as srgb must then be opened in PS and assigned prophoto and saved.  Thankfully only about 1 in 10 or 15 has this problem, but it is a slow PITA process.

Thanks.  I understand the difference.  What is puzzling is that PS isn't saving (embedding) the image profile on certain images.  If it suddenly stopped doing this on all images it would mean a setting was off.  Problem is that it is doing this on what appears to be a random basis.  I will continue to try analyze the differences between images where the profile is embedded and the ones where no profile is embedded, but so far after examining all aspects of many of these, I can't find any difference.

I did create an action to assign the prophoto profile to the errant images, but I still have to actually find them amongst all the images in a file.  In small files I just run the action on all images, but if I have several dozen images in a file it's faster to open them in Qimage, ID the ones that are srgb, and run the action on those.  If you know of a way to ID them in Bridge, that would help me.  Remember, according to the metadata, they are all tagged as prophoto even though some obviously do not have an embedded profile.

I removed my post on doing in Qimage because I could not get it to work properly with converting.
The really simple way, if you are printing in Qimage, is to use the icc override filter in a batch process.
It really surprises me that a so called professional colour management aware program uses tagging as an option. The "correct" and certain way is to embed always.
Even the modest Paintshop Pro embeds rather than tags.
Terry

Yes, I know that. The point was, why offer tagging as well, if that is what I understand to be the case. Doesn't sound as though it's very reliable though or very difficult to see what the settings are   
For the record, back to:
It does work, I said before:
That is correct, however you must put the input and output profile to be the same when there is no embedded profile and the image is known to be in that colour space. See attached screen shot.
Terry