After scouring the forums, both the Silverstripe and Uploadify; I wasn't sure which to specifically diagnose.
Using the latest Silverstripe (2.4.5), latest DataObjectManager and Uploadify (since 4/1/2011):
In attempts to upload anything, I end up with a white page, except for "Closing..."
With the following notable firefox error console errors:
Error: parent.jQuery is not a function
Source File: http://www.bengaltownship.org/beta/admin/assets/EditForm/field/Files/UploadifyForm?SecurityID=cd93d5a4242f540f89d1908a2a91a8fb4a2ed195&ctf[Files][start]=0&ctf[Files][per_page]=10&ctf[Files][showall]=0&ctf[Files][sort]=SortOrder&ctf[Files][sort_dir]=&ctf[Files][search]=&ctf[Files][filter]=&ctf[Files][view]=
Warning: Form contains a file input, but is missing method=POST and enctype=multipart/form-data on the form. The file will not be sent.
Source File: http://www.clientwebsite.org/beta/admin/assets/EditForm/field/File/upload?SecurityID=cd93d5a4242f540f89d1908a2a91a8fb4a2ed195 Line: 0
Interestingly enough, it seems to have uploaded the files... despite the nearly-White-Screen-Of-Death. My local WAMP version, wasn't able to get that far. I've worked with DataObjectManager and Uploadify with success in the past, so as far as I know it isn't blatant user error.