After upgrade to 6.5 Sprint, email won't delete off yahoo server?

[volvodr66]

I have searched and found similar issues but none exactly like mine. The problem happened after I upgraded to Sprint WM 6.5 stock rom. I have barely loaded any additional software and set up my email accounts as usual. I have gmail set up as exchange server (outlook). I set up yahoo (none paid version) as both imap and pop and tried just about every setting I can think of and when deleting email from my touch pro they will not delete off the server. The next time I connect, it just downloads the emails again. Any ideas??? Im at a loss on this one. Thanks in advance.