Smushing my website demaged some preview images, added plugin could not resolve that

Hi there,

I got support a few days ago concerning wp smush: After I used it, certain images seemed to be broken, but thanks to your support, most of them already went back to their places. Good job so far, but unfortunately I discovered this morning that again some thumbnail/preview images do simply not appear (e.g. "read more" pictures under postings).

Maybe this is important for you to know: The staff installed a plugin on my WP called regenerate thumbnails. Well, I have no clue how to handle it and would like to ask you if you have a second look on this? I would be really thankful :slight_smile:

I already grant access via dashboard.