have experienced the problem of exceedingly long delay to find out, when images have been to large.
It is though the site goes into meltdown before it responds.
Bit of a bummer as you have to re-post for us "fast" typists and equally fast memories make it hard to remember what you just did.
Don't suppose there is any way to leave the post as is in the rely box so it can be amended, pics re-sized etc, and re-posted