Remove/Eject & Rebalance doesn't work

Using 1.6.0a-46...

Join 2 servers, joining server B to pre-existing server A, and hit Rebalance to get both of them active.

In a web browser pointed at server A's web console UI, click Remove Server on server B, and hit Rebalance.

Nothing seems to happen, in that the screen just stays where it is, and doesn't show a rebalancing.

Doing a curl against (10.1.3.35) serverA's /pools/default provides...

curl http://10.1.3.35:8080/pools/default
{"name":"default","nodes":[{"clusterMembership":"active","status":"healthy","hostname":"10.1.3.106","version":"1.6.0a_166_gefc8175","os":"x86_64-unknown-linux-gnu","ports":

{"proxy":11211,"direct":11210}

,"otpNode":"ns_1@10.1.3.106","otpCookie":"puczavbbotrfvicp","uptime":"943","memoryTotal":2058928128,"memoryFree":54276096,"mcdMemoryReserved":0,"mcdMemoryAllocated":0},{"clusterMembership":"active","status":"healthy","hostname":"10.1.3.35","version":"1.6.0a_166_gefc8175","os":"x86_64-unknown-linux-gnu","ports":

{"proxy":11211,"direct":11210}

,"otpNode":"ns_1@10.1.3.35","otpCookie":"puczavbbotrfvicp","uptime":"895","memoryTotal":919715840,"memoryFree":58187776,"mcdMemoryReserved":0,"mcdMemoryAllocated":0}],"buckets":

{"uri":"/pools/default/buckets"}

,"controllers":{"addNode":

{"uri":"/controller/addNode"}

,"rebalance":

{"uri":"/controller/rebalance"}

,"failOver":

{"uri":"/controller/failOver"}

,"reAddNode":

{"uri":"/controller/reAddNode"}

,"ejectNode":

{"uri":"/controller/ejectNode"}

,"testWorkload":{"uri":"/pools/default/controller/testWorkload"}},"balanced":true,"rebalanceStatus":"none","rebalanceProgressUri":"/pools/default/rebalanceProgress","stopRebalanceUri":"/controller/stopRebalance","stats":{"uri":"/pools/default/stats"