The post you mention, suggested to try with the 2 jquery scripts out of the ZIP file; no change ( did clear cache).
The post also mentions to use the JQuery Regular option, instead of the Lite; I was using the Regular already ; no solution.
You can see the difference here :
Working with 3.7.8 : http://www.voerstreek.be
Not working with 3.8.0 : http://testvoerstreek.jvhit.be
The size of the actual image being loaded is correct on both when you right click on them for the properties ( around 200 height x 1000 width ).
Even the html source code displaying the images is exactly the same on both
starting at <!-- horizontal-outer-widgets-1 Widget Area -->
<!-- horizontal-outer-widgets-1 Widget Area -->
And even then the testvoerstreek.jvhit.be is not displaying the full width of the image...
Something in the CSS maybe...?
Thanks for your help, Sayontan, I would really like to stay on your latest release.