I'll try this again.....
Posting an image works the same for me as it does for you: when you/I click the image tab, a separate window pops up, you paste the link to your image in and click ok. the image link is then put into the tags.
All I'm saying is I do that process then click enter after each tag, so I avoid the horizontally stacked images problem.
EX: When typing a reply I do this:
Reply.......
http://www.autocarparts.com/images/product.../TL-S_Front.jpg [/ img] {enter}
http://www.autocarparts.com/images/product.../TL-S_Front.jpg [/ img]
More comments.......
(end post)
Does it make sense now?