XDCR: Replication fails to complete

On build 1636, upon running the automated test for load_with_ops via unidirectional replication with a 2 cluster (2 node each) set up, as:
./testrunner -i clusters_2_nodes_2.ini -t xdcr.uniXDCR.unidirectional.load_with_ops,items=5000,rdirection=unidirection,ctopology=chain,doc-ops=create

[Source: 10.3.2.54, 10.3.121.126]
[Destination: 10.3.2.55, 10.3.121.127]

Replication doesn't complete on the destination cluster, causing verification to fail as well.
Attached are the diags obtained from the 4 nodes.

On build 1621 however, replication completes successfully.

The Crash Report, on build 1636:

• • Reason for termination ==
  • {badarg,
    [
    Unknown macro: {erlang,monitor,[process,{xdc_rdoc_replication_srv,'ns_1@127.0.0.1'}]},
    {cb_generic_replication_srv,'-replicate_newnodes_docs/1-lc$^0/1-0-',2},
    {cb_generic_replication_srv,replicate_newnodes_docs,1},
    {cb_generic_replication_srv,handle_info,2},
    {gen_server,handle_msg,5},
    {proc_lib,init_p_do_apply,3}]}
    
    [ns_server:info,2012-08-24T18:33:14.781,ns_1@10.3.2.55:dist_manager:dist_manager:save_address_config:108]saving ip config to "/opt/couchbase/var/lib/couchbase/ip"
    [ns_server:debug,2012-08-24T18:33:14.782,ns_1@10.3.2.55:xdc_rdoc_replication_srv:cb_generic_replication_srv:handle_info:144]doing replicate_newnodes_docs
    [ns_server:debug,2012-08-24T18:33:14.784,ns_1@10.3.2.55:dist_manager:dist_manager:handle_call:225]save_address_config: ok
    [ns_server:debug,2012-08-24T18:33:14.784,ns_1@10.3.2.55:mb_mnesia:mb_mnesia:handle_call:133]Renaming node from 'ns_1@127.0.0.1' to 'ns_1@10.3.2.55'.
    [cluster:debug,2012-08-24T18:33:14.784,ns_1@10.3.2.55:ns_config:mb_mnesia:rename_node_in_config:158]renaming node conf {node,'ns_1@127.0.0.1',config_version} -> {node, 'ns_1@10.3.2.55', config_version}:
    {2,0} ->
    {2,0}
    [cluster:debug,2012-08-24T18:33:14.784,ns_1@10.3.2.55:ns_config:mb_mnesia:rename_node_in_config:158]renaming node conf nodes_wanted -> nodes_wanted:
    ['ns_1@127.0.0.1'] ->
    ['ns_1@10.3.2.55']
    [cluster:debug,2012-08-24T18:33:14.784,ns_1@10.3.2.55:ns_config:mb_mnesia:rename_node_in_config:158]renaming node conf {node,'ns_1@127.0.0.1',capi_port} -> {node, 'ns_1@10.3.2.55', capi_port}:
    8092 ->
    8092
    [error_logger:error,2012-08-24T18:33:14.784,ns_1@10.3.2.55:error_logger:ale_error_logger_handler:log_report:72]
    =========================CRASH REPORT=========================
    crasher:
    initial call: cb_generic_replication_srv:init/1
    pid: <0.451.0>
    registered_name: xdc_rdoc_replication_srv
    exception exit: {badarg,
    [{erlang,monitor,
    [process,
    {xdc_rdoc_replication_srv,'ns_1@127.0.0.1'}]}

    ,
    

    {cb_generic_replication_srv, '-replicate_newnodes_docs/1-lc$^0/1-0-',2}

    ,
    

    {cb_generic_replication_srv,replicate_newnodes_docs, 1}

    ,
    

    {cb_generic_replication_srv,handle_info,2}

    ,
    

    {gen_server,handle_msg,5}

    ,
    

    {proc_lib,init_p_do_apply,3}

    ]}
    in function gen_server:terminate/6
    ancestors: [ns_server_sup,ns_server_cluster_sup,<0.60.0>]
    messages: []
    links: [<0.332.0>,<0.452.0>]
    dictionary: []
    trap_exit: false
    status: running
    heap_size: 987
    stack_size: 24
    reductions: 1926
    neighbours:

[cluster:debug,2012-08-24T18:33:14.784,ns_1@10.3.2.55:ns_config:mb_mnesia:rename_node_in_config:158]renaming node conf

{node,'ns_1@127.0.0.1',compaction_daemon}

->

{node, 'ns_1@10.3.2.55', compaction_daemon}

:
[

{check_interval,30},{min_file_size,131072}] ->
[{check_interval,30}

,

{min_file_size,131072}

]
[cluster:debug,2012-08-24T18:33:14.785,ns_1@10.3.2.55:ns_config:mb_mnesia:rename_node_in_config:158]renaming node conf

{node,'ns_1@127.0.0.1',isasl}

->

{node,'ns_1@10.3.2.55', isasl}

:
[

{path,"/opt/couchbase/var/lib/couchbase/data/isasl.pw"}] ->
[{path,"/opt/couchbase/var/lib/couchbase/data/isasl.pw"}

]
[cluster:debug,2012-08-24T18:33:14.785,ns_1@10.3.2.55:ns_config:mb_mnesia:rename_node_in_config:158]renaming node conf

{node,'ns_1@127.0.0.1',membership}

->

{node, 'ns_1@10.3.2.55', membership}

:
active ->
active
[error_logger:error,2012-08-24T18:33:14.785,ns_1@10.3.2.55:error_logger:ale_error_logger_handler:log_report:72]