assist not show image in post

Hi guys,

I'm new to this drupal stuff so please forgive me if I'm being stupid :-)

I'm using image assist in conjunction with image import and the TinyMCE editor and have the following iusses.

Firstly, but less important, I can only insert an image when I disable rich text editing.

Secondly, and a HUGE problem, when in edit it shows the image but the moment I click save it shows the code on the page rather than the image?! Like this

[img]sites/default/files/images/welcome.thumbnail.jpg[/img]

I have BBcode module installed so it shouldn't be an issue understanding that.

Anyone had this problem or know a fix?

Cheers,
Jim