It looks like style css are not imported to the right directory.
And why do you not install the latest version for phpbb 3.0.12 called ?
A good idea is to provide an address of your board.

It looks like U have a problem with your mouse (wrong settings probably).

If I'm not mistaken, for the latest mChat, code should looks like this: Find This may be a partial find and not the whole line <dl class="icon"> <dt><!-- IF MCHAT_ARCHIVE_MODE -->{L_MCHAT_ARCHIVE_PAGE}<!-- ELSE -->{L_MCHAT_TITLE}<!-- ENDIF --></dt> </dl> Replace with Replace the preceding ...

Do you suggest something like: "kill him" ? <!-- s:o --><img src="{SMILIES_PATH}/icon_e_surprised.gif" alt=":o" title="Surprised" /><!-- s:o --> <!-- s:shock: --><img src="{SMILIES_PATH}/icon_eek.gif" alt=":shock:" title="Shocked" /><!-- s:shock: --> :wtf: I ask my wife, she can do it :mus...

Sorry, I'm not a killer :wasntme:

So he is dangerous for my plants only, I can live with that, thanks

Run the mchat_install.php file in your browser and see what happens.

Grrrr, had never before seen. Is it dangerous?

Ok, I know what it is.

http://youtu.be/Gv-ASytWjgQ

Does anyone know what it could be? Found it in my garden.

I touched it (very lightly) and then he squirted something in such a way (from his back side):

Thanks mate, I've never seen before

Is this MOD or some magic code?

User style.PNG (14.29 KiB) Viewed 2066 times

Check overall_header.html file (of your style), above code, that there is no jQuery double declared.

Besides, we can't see your mChat (test account welcome).