I have never had 2.4 because of my recent puchase, but I have complained of this problem since getting my v2.5 going.
viewtopic.php?f=3&p=8695

The only way I have found to get around the filespace issue is to install the Progress Bar code. The space issue is a bug that I think exists in 2.5.

The other major issue that I had and now I think you all are finding is that 2.5 does not import files correctly from other sites or from its own upload directory.

Lastly, I have never seen batch processing work but that would require more cron investigation on my server. At least Realtime processing is working.

-server is Dreamhost!?...