Stock MMS - SMS problem?

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http://forum.xda-developers.com – I have problem with stock SMS-MMS application. In one conversation with some person (thread) , I can receive sms and reply without no problems , but if I receive MMS from the same person, after that MMS , I can't reply anymore, If I type the message (sms or mms) and hit the "send" button it returns me a "message failed to send" message. I have to delete all thread with that person and start new one to be able to send sms or mms to that person... Do you face the same problem , and does anybody know how to fix this? Thanks (HowTos)