Looks like Qimage is telling you that you have unsupported formatted images in the folder.
I cannot tell you which and why, but perhaps the Mac is nutzing up the files, or some other intermediate software that you use is saving its files in some proprietary format.

If you were to make a NEW FOLDER and transfer all  the images three at a time perhaps, to the new folder, and open Qimage looking at the them 3 at a time, and keep doing that until you get that error message from opening the New Folder, you could isolate one or all bad formatted images.

Email one to me...  wathree.ssz@verizon.net and then we can see why it wont open.

Fred

Should be another thread but I'll reply.

I had a folder in which I had some test targets called Getty something that I downloaded in zip format. QImage would crash all the time that folder was accessed. They were created I believe with Macs. I did not get the warning, just a shut down of Q. After I reset everything in Q so it did not open that folder as last used it stayed open until that folder was accessed. Macs at some point in time in some formats use a different byte order than PCs and sometimes in network transport that order gets reversed. I think its tiff version is one.

Maybe my experience helps.