BIGpipe unknown modification error: 01070733:3: Incorrect password or you may not change your password yet. Failed to change user's password. Exiting.
can you check if auth source is identical in bigpipe and configuration file (bigip_sys.conf)? if not, can you try to force mcpd to reload the configuration?
sol13030: Forcing the mcpd process to reload the BIG-IP configuration
http://support.f5.com/kb/en-us/solutions/public/13000/000/sol13030.html
[root@ve10:Active] config b system list
system {
auth source type local
gui setup disable
hostname "ve10.acme.com"
mgmt dhcp disable
}