See this post <br />http://www.ubbdev.com/forum/showthreaded.php?Cat=0&Number=115254 <br /> <br />I add one post (thread) and attach t1.jpg <br />and edit the post and attach t2.jpg , and t1.jpg remains on server , <br />and edit the post and attach t3.jpg , and t1,t2.jpg remains on server , <br />and edit the post and attach t4.jpg , and t1,t2,t3.jpg remains on server , <br /> <br />If , you (admin / Scream ... or other staff) delete that post , <br />You will find that only the last attachment (t4.jpg) be deleted . <br />And t1.jpg , t2.jpg , t3.jpg remain on server , become 'orphan' attachments.

If you check the delete attachment box while uploading the new one, does it leave it on the server as well?<br /><br />And, um, bugs should be reported at http://www.ubbcentral.com so that they can be logged. This isn't an official site, and bugs reported here don't neccessarily getted considered when they're coding new versions.