Hey is there anything I can do to help with the update to hasmanyfilemanager? I got the same error, so went to silver stripe 2.3.0, it works but not how I remember it. I remember it being nicely laid out with image info on the right and drag and drop reordering. You probably already know but I'll post a screen grab anyway.
I tried out DataObjectManager but I whats up with "DataObjectManager requires the SWFUpload module." when you navigate to files and images? I can't see the swfupload module. I guess this hasn't been updated with 2.3.2 yet.....?
OPS! Sorry UncleC I found your swfupload module in the unsupported module section. I get some funcky errors when in the assets admin section of 2.3.2. Giving it a go on 2.3.0 now