I haven't had an issue posting single images, only counts >1 seem to be an issue. Is that true for you as well?
I believe so......not 100% sure.
Never had issues until a few days ago when other images/attachments I'd posted got linked into the wrong posts.
Had to delete the attachments and re-upload them then re-link them to where they needed to be.
Annoying but fixable.
Rarely use the direct embed image thing or the drag and drop instead sticking to the old method we've had for years until recently when it corrupts links from thumbnails to between [i m g]
link [/ i m g] flags whereas from the 2nd attachment box seems to work fine....for now.