I don't know if it is a bug of laytheme, Safari, Mac OS, my machine, a plug-in etc...
Since 2 days some thumbnails disappear on my front page when using Safari. Chrome and Firefox don't have this issue. Some images are just shown as box with a question mark. The images open when clicking on them.
I tried to regenerate my thumbnails with the plug-in that is suggested. That works for a moment then some thumbnails randomly disappear again.
Any ideas? (deleting cache and stuff didn't help — www.danielweigel.xyz)