For some reason, LTC p2pool says the other LTC peers have invalid shares.....
Perhaps THEIR wallets are old / were not updated.....

Goldmine is running the most recent version of Litecoin wallet + blockchain

Bitcoin & Feathercoin are connected to other p2pool peer nodes + no issues.

AuroraCoin is also connected to other peers + no issues.

also, ISR IsraCoin was added today, upon request

More Coins will be added soon.