Category Icons in Second Catalog are defaulting every time it's opened

wyenot said:

I am talking about the Nature etc. If I delete them they come back next opening and if I change the icons they come back with the default blue arrowhead. 

I guess they are the old "system" tags that cannot be deleted permanently.  

There is something wrong with your color picker.  The only thing I can suggest is to try resetting the preferences file. Immediately after launching the Organizer, press Alt+Shift+Ctrl. A message should pop up asking if you want to delete the Settings file. Answer OK. (Sometimes the message appears behind the main window/splash screen.)

What OS are you using?

If you are talking about the Nature, Color, Photography and other keyword tag default categories, you should be able to delete them by right-clicking on the category and deleting the tag category.

If you are talking about the system categories:  People, Places, Events, then no you can't delete them.

You can have as many catalogs as you want.

wyenot said:

Also as others have mentioned, I do not see colours when editing the icons but can change the colour by guessing what it might be on the blank box.

I'm not sure what you are referring to here.  Please gives us a screenshot.  You can change the appearance of keyword tags to include an image in the icon, in Edit>Preferences>Keyword Tags and Albums:

You can also change the icon and color of a keyword tag icon by using a right-click and selecting Edit from the context menu: