Hi Chris
Did you try re-installing your ASDM file ?
The asdm-615 bin file is almost 7 MB (7598456 bytes)
Cisco Adaptive Security Device Manager for ASA 8.0(2), 8.0(3), 8.0(4), 8.1(1) and 8.1(2).
You also have the the new version ASDM 6.2.5
asdm-625.bin
Release Date: 11/Jan/2010
Cisco Adaptive Security Device Manager for ASA 8.0, 8.1 and 8.2.
Size: 11584.20 KB (11862220 bytes)
Check the appropriate ASDM image and you can install and check if it works good.
Hope this helps.. all the best
Raj