Found this useful tip regarding APC PowerChute Business Edition Agent. When it comes to a default admin password: There is none! If you need to reset your username/password, you'll have to reinstall the suite on your server/workstation/whatever. In the process, I ended upgrading from v8 to v9 using the free 5 node edition found here:

http://www.apc.com/tools/download/software_comp.cfm?sw_sku=SFPCBE90&id=125&swfam=125

More details along with the original blog post can be found here: