(ipv6) Problem using TSP: router advertisements incorrect?

Dear IPv6 users,

I have recently tried to set up a TSP client to use the TSP protocol to
automatically set up IPv6 over IPv4 tunnels.  I could get it to work and see
the dancing turtle (kame) for one host using anonymous mode, but when I
tried for a PC router configuration with a windows PC, the PC router was
able to see the dancing turtle, but other nodes were not.  The PC router
appeared to be sending out ICMPv6 router advertisements, but the surrounding
hosts didn't appear to be picking up, and they didn't auto-configure.  Any
ideas why?

I tried with both Windows and Linux for the surrounding hosts, but neither
appeared to have picked up the router advertisements to auto-configure,
although tcpdump showed that ICMPv6 router advertisements were indeed being
sent out.  Is there some subtle misconfiguration of a windows PC router that
could result in such behavior?

sorry if this has been asked before but I missed the answer.

thanks
Daniel