If you where rebuilding mediums maybe you did not finish actually building them. In fact clicking around your gallery I see absolutely no medium images that have been created and all the images where over 600 pixels.
After setting a medium threshold under upload options and saving that did you actually go to scan database in admin and toggle create mediums and run that. It would have to be done after you set the threshold not right after the import as if it was still 0 when you ran scan database nothing would be created.
I cleared out all original size stuff in that importer so it only uses the resized file see if that helps you but thats the extent of support I can provide on an unsupported script I posted as a tool for users 5 years ago.
I used the importer you told me to use to move from vbGallery to Photopost Pro.
I renew a license and bought another one, cause you told me it worked fine.
Don't know, maybe i didn't understand some of the options, I check my folder and all the wallpapers are 600px width. The medium images were not created and the image sizes for those 600px images are big.
Could it be that the script didn't import the original files, but the medium images from vBG instead?
Or that some of my settings are wrong? -image attached
Like I said you can try redoing your import fresh and see but I really have nothing I can add about a 5 year import script your talking about that thing not the actual pro application which appears to work fine.
Your free to modify test redo anything you want with that import tool it is provided free for you to use as I have said before.
However any issue you might have as a result of the import not doing something right is not a support issue. That is not part of the actual supported photopost application. We do not provide support for a 5 year old tool which is posted as is.
I guess that is where you are misunderstanding here.
Like for instance I know the import script will check for an original file which it tries to but in your case it fails to find an original so your issue was it was stretching your mediums out to the original size which was your issue.
Therefore I made a quick change to that script so the you did not have that issue. It is not finding your original images.
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The code in bold is all I removed from the import script to resolve the issue and allow a successful import that you see now which looks fine although yes it is using the main vbgallery images not optional original images which do not exist in all installs.
I can not say why it is not finding your original images.
Feel free to add those lines back in your vbag.php file and try again. Your free to modify that tool all you wish to do whatever you wish.