Problems with MRC 989 charger

[ssspconcepts]

Just curious if anyone else has experienced this:

I have been using the FlightPower Balancer with my MRC989 Charger in charge/balance mode for quite awhile without any problems. The other night my balancer blew the 10A fuse...I replaced it and it blew again. So...I replace the fuse a second time and use my MRC977 charger and everything works okay. I then tried using the MRC989 to charge a Lipo pack without the balancer connected...it worked fine. Anybody here have any idea what would cause this?