I know there has been another thread on this, but it was fairly old and although it says in there that this bug was fixed in r513 I am currently running a fresh install of the latest stable release 2.4.5 and and latest DataObjectManager module and am having this problem.
I initially had this problem using the DataObjectManager along with Uploadify, and have tried switching back to SWFUpload thinking it was an uploadify bug, and now tried removing that and testing the site using just the DataObjectManager module and a simple text field.
The site is running on an Ubuntu LAMP server and the error I'm getting is:
[Notice] Undefined index: start
Line 142 in /home/user/sites/testSite/web/dataobject_manager/code/DataObjectManager.php
Has anyone else had this problem, can anyone help me?