alanft

there are some themes that prevent is_home and is_front_page from evaluating correctly. try quickly switching theme to a default one. if the problem goes away, then you will have to do some digging in the theme code you have

http://codex.wordpress.org/Template_Tags/in_category

in the case of calling in_category with 2 parameters, the 2nd one is the post ID, so in_category(6,770) will be always false or always true, regardless of what post/page/etc you are looking at.

if you are absolutely sure that post 770 is in category 6, then that should always be true and that widget will always show. so i can’t explain what you are seeing.

the form is_single() && in_category(array(1,2,3)) should do what you want. if it’s not, see if it IS working when you switch to a default theme – just to check if the theme code is interfering with WP stuff behind the scenes that alters the evaluation of those conditional tag.

It can help

you could use logic that returns false under the circumstances that the content is empty, of if that logic is too complex you could use the widget_content filter. you’d have to write a function that tested if the full HTML content of the widget was empty, and then return an empty string

you want !(is_page(…) || is_page(‘blog’))

that is, no semicolon (that’s making the statement invalid which amounts to the same as returning false, and you want everything ‘OR’d inside brackets with an ! (NOT) on the outside.

i.e. NOT (A or B or C or D or page E)

And according to http://codex.wordpress.org/Conditional_Tags#A_PAGE_Page you should be able to use is_page(array(x,y,z)) where x y and z are mixes of page IDs, slugs etc

Have you had a quick look at http://wordpress.org/extend/plugins/widget-logic/other_notes/ ?

One of the first example is

!is_page(‘about’) — everywhere EXCEPT this specific WP ‘page’

the blog page depends on how you have your blog set up. on the WL faq at http://wordpress.org/extend/plugins/widget-logic/faq/ it says

“Another source of confusion is the difference between the Main Page and the front page.”

linking to http://codex.wordpress.org/Conditional_Tags#The_Main_Page

It’s not free by the looks of it. Sorry. If you want to give me read access to your install I might be able to spot something – but I realise that’s perhaps a step too far to fix this.

i posted on your similar thread that does appear to be a clash between WL and your chosen theme. Unfortunately I do not have access to your theme’s code so it will be hard to troubleshoot the issue.