when you add Power CMS Builder to your site it will try to create a folder in the root called images, Since you already had a folder named images, it put the image files in your image folder, but by using a capitol I for the folder name, it is causing the PCMS Scripts to fail, this will happen on linux based servers where the folder names are case sensitive.
you should rename the Images folder to images.
I did as you explained above and to some extent it did work, but not satisfactorily unfortunately. I decided to redo the whole site and lo and behold, exactly the same format inside the admin folder has appeared again.
I have attached an image to show the result.