fail to online upgrade from 1.7.2 to 1.8.1 on windows

Install membase server 1.7.0 on 4 windows server 2008 R2 64bit
Create a 4 node cluster with 3 buckets
Load data to 3 buckets
Remove node 69 and rebalance. OK
Uninstall membase server 1.7.0 on node 69 and install couchbase server 1.8.1r-769 to this node
Add node 69 back to cluster and rebalance. FAILED

See error in log page:

Conflicting configuration changes to field

{node,'ns_1@10.1.2.69',isasl}

:
[{'_vclock',[{'ns_1@10.1.2.69',{1,63502524172}}]},

{path,"c:/Program Files/Couchbase/Server/var/lib/couchbase/data/isasl.pw"}

] and
[{'_vclock',[{'ns_1@10.1.2.69',{1,63502522694}}]},
{path,"c:/Program Files/Membase/Server/var/lib/membase

Conflicting configuration changes to field

{node,'ns_1@10.1.2.69',memcached}

:
[{'_vclock',[{'ns_1@10.1.2.69',{1,63502524172}}]},

{port,11210}, {dedicated_port,11209}, {dbdir,"c:/Program Files/Couchbase/Server/var/lib/couchbase/data"}, {admin_user,"_admin"}, {admin_pass,"_admin"}, {bucket_engine, "c:/Program Files/Couchbase/Server/lib/memcached/bucket_engine.so"},
{engines,
[{membase,
[{engine,"c:/Program Files/Couchbase/Server/lib/memcached/ep.so"}, {initfile, "c:/Program Files/Couchbase/Server/etc/couchbase/init.sql"}, {static_config_string, "vb0=false;waitforwarmup=false;failpartialwarmup=false;shardpattern=%d/%b-%i.mb;db_strategy=multiMTVBDB"}]},
{memcached,
[{engine, "c:/Program Files/Couchbase/Server/lib/memcached/default_engine.so"}, {static_config_string,"vb0=true"}]}]}, {verbosity,[]}] and
[{'_vclock',[{'ns_1@10.1.2.69',{1,63502522694}}]},{port,11210}

,

{dbdir,"c:/Program Files/Membase/Server/var/lib/membase/data"}

,

{admin_user,"_admin"}

,

{admin_pass,"_admin"}

,

{bucket_engine, "c:/Program Files/Membase/Server/lib/memcached/bucket_engine.so"}

,
{engines,
[{membase,
[

{engine,"c:/Program Files/Membase/Server/lib/memcached/ep.so"}

,

{initfile,"c:/Program Files/Membase/Server/etc/membase/init.sql"}

,

{static_config_string, "vb0=false;waitforwarmup=false;failpartialwarmup=false;shardpattern=%d/%b-%i.mb;db_strategy=multiMTVBDB"}

]},
{memcached,
[

{engine, "c:/Program Files/Membase/Server/lib/memcached/default_engine.so"}

,

{static_config_string,"vb0=true"}

]}]},

{verbosity,[]}

], choosing the former.