Apparently the games are being coded so you dont scoresend every 5 seconds on SOSD or MSN, so I found a simple solution: let at least 10 seconds of gameplay pass, time between rounds doesn't matter.
I figured I was being too fast when every score under 10 seconds was being treated as invalid session.
Also, if you get that error, you dont need to refresh the whole page. Just start another round.
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so ive tried 10, 20 and even 30 and im still getting invalid session (at work). i will try this at home cause im currently at work so im not sure what the issue is it still wont let me send and i dont think we have a proxy. i will test and edit comment when i get home to try again.
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sending scores does work at home and indeed if you do send to quickly you must wait 10 ish seconds i do about 15