Forum Some text colours when posting not working?

[محروم.كوم]

Since upgrading from VB3 to VB4 I've noticed when posting that some colours aren't working, as in they don't change the colour of the text, instead the code is visible and where the colour name should be, instead there are RGB values, it seems to be the same here, see below. I used the text colour drop down and chose the slate blue from the top row


[COLOR="rgb(75, 0, 130)"]this text colour isn't working[/COLOR] __DEFINE_LIKE_SHARE__