RViz & amcl - fixed_frame mismatch for initialpose

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I have a multi-robot system (two robots, for now) in which each is pushed into a namespace (/robot1 and /robot2) using Jakub's answer on how to setup a mulit-robot system (which I updated for Indigo and use the Pioneer 3dx instead of the turtlebot).

Most everything is working fine except for when I try to set the inital pose manually for amcl using RViz. I set the fixed_frame to be /map which is what both robots (and amcl for both) are using. amcl is subscribed to /robot1/initialpose for one robot and /robot2/initialpose for the other so, using the Tool Properties in RViz I set the topic for the 2D Pose Estimate to be /robot1/initialpose.

When I attempt to set the pose from RViz I get the following warning from amcl:

Ignoring initial pose in frame "map"; initial poses must be in the global frame, "/map"

This warning comes up despite the fact that I set /map as the fixed_frame in RViz. When I echo the topic and set the pose, I get this:

header: 
  seq: 0
  stamp: 
    secs: 282
    nsecs: 751000000
  frame_id: map
pose: 
  pose: 
    position: 
      x: 25.1116027832
      y: 51.6672058105
      z: 0.0
    orientation: 
      x: 0.0
      y: 0.0
      z: -0.827484384125
      w: 0.561488730099
  covariance: [0.25, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.25, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.06853891945200942]

which results in the above error (note the frame_id of map without a /). However, if I publish the same message myself but with a frame_id of /map instead of map I get the following output from amcl:

Setting pose (408.542000): 25.112 51.667 -1.949

How do I change thefixed_frame for the initialpose or am I missing sometheing here? Is it a bug?