I have attached a map of the test network. It is the ring in the lower right corner.
One out of 5 routers I setup with MPLS doesn't respond to Winbox well after enabled. I can ping it, I can telnet into it, but I can't Winbox into it. Once I disable MPLS, all is well. Below is the MPLS export for the failing router. To the best of my knowledge I followed the directions on the wiki.
[admin@HammettFarms] > /mpls export
# jan/01/1970 00:21:07 by RouterOS 3.17
# software id = EDV4-LTT
#
/mpls
set dynamic-label-range=16-1048575
/mpls interface
add comment="" disabled=no interface=all mpls-mtu=1508
/mpls ldp
set distribute-for-default-route=no enabled=no hop-limit=255 loop-detect=no lsr-id=10.1.255.3 path-vector-limit=255 transport-address=10.1.255.3 use-explicit-null=no
/mpls ldp interface
add accept-dynamic-neighbors=yes comment="" disabled=no hello-interval=5s hold-time=15s interface="South PPPoE" transport-address=0.0.0.0
add accept-dynamic-neighbors=yes comment="" disabled=no hello-interval=5s hold-time=15s interface="ICS Private" transport-address=0.0.0.0
/mpls ldp neighbor
add comment="" disabled=no send-targeted=no transport=10.1.255.2
add comment="" disabled=no send-targeted=no transport=10.1.255.5