History Log and client problems

Q1

Hi everyone. My apologies for my english, it is not my native lenguage.

Just I wanted to know if there is the way to remove or disabling the chat hostory. I mean... when I create a MUC, I see all the time in the conference stuff like this:

User1 joind conference
User2 left the chat
User3 ...

And it's really annoying, because when I want to see a previous message, I have to drag my screen all the time. I use XABBER for Android and PIDGIN for LINUX.

Both of them have the same issue. I have tried to disable in client's setting.. but nop.

Q2

I am using jappix and mini jappix. They are XMPP web client. I have a incredible problem that I am aware not the ejabberd fault. Unless I guess so.

We have three scenarios: MUC

- User1: PIDGIN
- User2: Xabber Android
- User3: Jappix
- User4: MiniJappix

User1 writes: Everybody can see the message
User2 writes: Everybody can see the message
User3 writes: Everybody can see the message
User4 writes: I dont know why the hell everybody can see the message except the User2 (XABBER ANDROID).. but... and this is worse... sometimes the message appears, sometimes not.

What is going on guys? or... any leak please?

Thank you very much in advance.