I have been able to reproduce the issue.  Went back to the original CR2 file, used PhotoNinja to create a new JPG using the current settings.   That new image, before FastStone resizes it, causes the access violation.   If I use FastStone to resize it to 2100x1500, I still get the access violation, so it must be an original metadata field/tag.

FWIW just set up a Canon Pixma Pro-100 on the network, modified the existing QImage printer jobs with the new printer driver and color profiles (other settings are basically the same as for the Pixma 9000 Mk2).  Works flawlessly.

Where do you want me to email the problem file?

Did as instructed, found one image that consistently generated the INVALID POINTER error message when moving the pointer over it.  This image, like the others, had been resized to final dimensions using FastStone 6.0 (1500x 2100).   If you generate this message a sufficient number of times, you will get a lockup.

As an experiment, I opened this image with Affinity Photo, added a Vibrance layer, boosted the vibrance by 10 per cent just to change something, then exported it back as a JPG, with the same filename (not a real important picture).  Opened up QImage to that folder, hovered the pointer over one image after another, no issues -- including the former culprit.

I did note a significant difference in file size between the exported Affinity Photo JPG and the FastStone JPG.  I'll do some further tinkering with this, but I think you may be on to something.  When I find another problem image I'll pass it along.

Well, I would like to be able to pinpoint the problem to one or more JPG files but it seems to occur with all of them, randomly. 

Just this morning I both started QImage Ultimate by drag-drop from IMatch and by double-clicking the desktop icon, looking at different folders.   As soon as I clicked on a thumbnail I received the INVALID POINTER error message, followed by a crash, i.e. no images were in the print queue.   Then I went to a large folder (1700 images) of B/W scans.   Used drag-drop to start QImage, waited for the thumbnails to rebuild, and had no problems, printed several B/W images (these are all to a Canon Pro 9000 MkII) for testing purposes.  I then closed QImage, went to a folder of pictures from yesterday (all JPG processed out from RAW using PhotoNinja and then resized using FasttStone), switched to Red River Aurora Satin paper, chose a couple of images, sized for both on the same page, and printed them -- no problems.   Went I exited QImage it crashed with only the standard Windows crash dialog.

This is all on the .1703 build now of Windows 10 ENTERPRISE.

Follow up.  Restarted QImage Ultimate 2018.101 and chose SAFE mode.   Application reset its user interface to the defaults, and chose the system default printer, which is not the photo printer.   So I recalled the appropriate Printer Setup job and all was back to normal.   Printed a few things.

Just today I drug an image file from IMatch onto my QImage Ultimate favorite, and it opened up to the image folder.   I then drug that image file onto the PRINT page and received the dreaded INVALID POINTER error.  I tried to close QImage, no response, and then eventually received the exception failure dialog and Windows terminated the process.   So back to square zero;  the old QImage Pro works and QImage Ultimate isn't reliably working.

Follow up:  just realized I actually running 2017.126; I had noticed the 2018.101 in the titlebar and assumed that was the version in use.  I'll let you know what happens once I apply the update.

Yes, I shut it down with the Task Manager several times.   Upon restart, it asked for a settings reset which I declined.  After several iterations of this, I launched my old QImage Pro from 2009 and it had no issues browsing folders or printing a few things.  But drag/drop from IMatch doesn't work with that version.

I had thought there may be some interaction with Affinity Photo, which I had used to open/export/close a number of image files (I have run into memory leaks before with Affinity Photo).  So I shut down Affinity and tried out QImage Ultimate again.  Drag/dropped a few files, printed a couple, and then got the INVALID POINTER message.  At that point I closed QImage Ultimate and it crashed on exit with the usual 'windows is searching for a solution' message.

Has anyone else had these issues on Windows 10 x64 ENTERPRISE?  Most of the time when I use QU there is either a lockup or a crash.  It almost invariably crashes upon exit.  I upgraded from my old QImage in order to get drag/drop to work with IMatch.   That usually works, but if QImage points to a folder other than the one the dropped file is in, more than half the time I receive a pointer access violation error.   Sometimes I can go on to print, but sometimes not.   Invariably there will be a lockup.

This is the .1607 build of Windows 10, i.e. the Anniversary Update.   32Gb system memory.

Thanks, I have it working.   As I posted above, while I had copied settings to a new location, I had not told QImage to use the new location.  Right now making a few prints to see how things go and kick the tires on the new user interface.  I do have drag/drop working in IMatch, so that problem is solved.

Nevermind, figured it out.   While it had copied settings to the new location, it wasn't using the new location.

Well, I just installed QImage Ultimate and I don't see any way to import my old QImage Printer Setup jobs to the new system.   The MIGRATE command under the UTILTIES menu just changes where QImage Ultimate stores its own settings.   I have tried manually copying the old printer setup job profiles to the new location but QImage Ultimate doesn't pay any attention to them.

Is there anyway to avoid having to re-create all of these stored printer setup jobs?

All you have to do then is select the images you want to print in IMatch and click the QImage icon in the favorites panel.
The images then open automagically in QImage.

Yes, I tried that with my current QImage (circa 2009).  Under Windows 10 it does not work since QImage uses a folder on the system drive for temporary files and doesn't have write access for that -- and I don't plan to make system level changes for security reasons.  So that is the core question:  does QImage Ultimate play nicely with Windows 10 so that I can use this method for printing?

The other question I have is whether Ultimate will import the current PRINTER JOB settings I have for my old QImage, or will I have to recreate all of them.   This is one of the things I really like about QImage, single click changes for paper and profiles (and printers themselves).

Been using QImage since 2008, thinking about upgrading to Ultimate in order to bring everything up to speed.   I use IMatch for DAM for all my photos.   I see that you now have plugins for direct printing from Adobe apps;  how does this work for IMatch?  The old QImage that I have doesn't play quite that well, I have to copy things to a TO PRINT folder and then open that in QImage; a bit cumbersome.   Would be nice to have something more steamlined.

FWIW, this is using Windows 10 x64 ENTERPRISE. 

Thanks for any info.