if subnet 10.44.1.0 is directly connected to 7606 RPF=0.0.0.0 means that the local node is the source PIM node (= the source is in a connected subnet).
So this shouldn't be a problem if 10.44.1.10 is directly connected on C7606 (in other words if sh ip arp 10.44.1.10 is not empty on C7606)
2) this should depend from the fact C6509 thinks no one is interested in the stream (10.44.1.10, 126.96.36.199) but if so interface gi5/3 shouldn't appear in the oilist for (10.44.1.10, 188.8.131.52) on C7606.
Have you seen if over time sh ip mroute 184.108.40.206 keeps showing interface to C6509 in oilist?
is the PC trying to join to group 220.127.116.11?
what shows sh ip igmp groups on the C6509?
and is the RPF check passed on C6509?
use sh ip rpf 10.44.1.10
for this it should show the interface connected to C7606:gi5/3
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