4
hmmm, I have used 2.2.4 on most of my productive sites, and I have to tell ya I have never come across this.
I have noticed that caps dont work in bbcodes
i.e.
[img] works
[IMG] does not
(which is pretty weak.....)
but never come across this one.
The only setting that would influence signatures is in the users profile "Always Attach My Siggy" or in the actual post "Attach Sig".
There was a similar problem with phpbb a long time ago, and it arose from users using the Quick Reply box. Instead of posting via "Reply". Best guess is to see if by using reply instead of quick reply your problem goes away.
You may also check to see that
Quote:
Enable Media Features
Display attached Images directly in the post.
is enabled.