The problem with the missing images can also be found on my websites.

If the images can still be found in Website X5 and in the preview of WebSite X5, then click on "Preview" at the top while holding down the left Ctrl key and wait until the lower scroll bar has completely scrolled through. This will restructure the pages.

Then export the entire website to the Internet, not just the updated files.

Request the files again from the web server in the browser using the key combination Ctrl + F5, then the images should be visible again.

Sometimes the images in WebSite X5 are missing in the image objects or as a background image in the line style; reinserting the images helps here.

Some other users also have the image problem.

Thanks. 

After exporting the complete website, images appear which were not appearing previously. But some other image gets disappeared. What to do please. 

What if the now missing images are added again in the corresponding objects in WebSite X5?

I had the same problem and had to add all the images again across multiple pages. It was such a time-waster.

Dear Daniel W.

If I add missing images and upload the website some other images go missing.

Dear Nigel B.

Sorry to say, but Website X5 support team is not at all active. They are just selling a product and earning money. Not interested to give a support to their customers who are suffering because of their ignorance. 

The program keeps losing images, but I don't know why and Incomedia probably won't do anything as long as only a few users report missing images.

So far the only thing that has helped is adding the missing images and checking whether all the images on all pages are still there after the Ctrl + F5 key combination.