Squad navigation glitch

in GAC -> Edit Defense

Select a Zone, editing my oQGJ squad, 

Select one of the toons, use the little right-arrow to view the other toons.  After 2, 3, maybe 4 clicks, I get a spinning wheel of death and the game permanently hangs in that state.

This only happens with that one particular squad.  The only way out is to force-close and restart.  I've repeated the process five times to confirm; and it happens with no other squads in GAC.

(to test, I deleted the squad and re-created it, and it still occurs;  specific toons, if it matters: oQGJ, JKA, KAM, Mace, Barriss)