It's a litle hard to tell what's going on by your post. If you ever have connection problems through the PIX, the best bet to troubleshoot it is to turn on syslogging, the PIX will tell you exactly what's going wrong then. Do the following:
you should not need an access list entry for the outside interface - the pix is a stateful device, so that so long as you permit the rdp connection to leave the dmz interface, the stateful replies should come back in.
on a show access-list - do any of those 2 lines have numbers to indicate that have been used - hitcnts ?
the proxy server could easily be a problem - are they any logs for it?
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We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...