Still seeing more new reports of the "Your attachment has failed security checks and cannot be uploaded. Please consult the forum administrator." popping up around the place, like here: https://www.eevblog.com/forum/beginners/unable-to-post-images-any-longer/?topicseen
Just had one of these ^ with an image I've posted without issues before.
It was taken with an iPhone and compressed with MS Picture Manager where iPhone images are always 90o off correct rotation yet always post correctly.
However the JPEG filename for this chap had the dreaded [1] in it signifying that it had been saved before. Renaming it wasn't enough to get it accepted by SMF however opening it in MS Paint, rotating it and saving it as a .png had SMF forum SW happy and it was posted.
So likely there is a check in SMF which somehow doesn't accept all JPEGs.
Who TF knows, SMF seems to have more bugs than some certain brands of scopes.
I went back to using Flickr instead of uploading pictures to the forum.
This JPEG bug is not hard to work around as you just need open the file in a pic editing program and save it in another format like PNG.....30s of your time.
The ability to put attached pictures inline in posts seems to have stopped working as well.
Well yes and you should know how to work around this too and do it as we historically had to before Dave enabled inserting images directly within a post.
I never found it comfortable to use as it didn't always give the result I needed so have always uploaded thumbnails onto the EEVblog server then edited the post to place the thumbnail URL within IMG flags and anywhere in the post that suits. Normally I post with a place keeper that relates to the image I need to insert later in editing like im2, im5 or whatever and delete it after the post is fully edited before saving the edit.
Sure it's a bit of stuffing around but works like a charm as it has always done.
That the first attachment box is also troublesome in SMF adds another level of fun to posting although skipping it and ONLY using subsequent attachment boxes from (more attachments) works perfectly without issue.
Like a crappy piece of equipment we learn to work with what we have to get the result required.