Thread:Project:Support desk/Problem with categorization

Hi All, I read a lot about using categories in mediawikis, so I have decided to go for it.

ISSUE

I have added an internal article to an  existing  category called "Linux commands" (only first character in capital... al the rest in lower case) using the following: 

As a result I have got correctly the link to this new category at the end of my page (so the article itself get categorized correctly) but the link to it is red despite the fact, as specified above, this category already exists!!!

If I click on this category (Linux commands) it brings me to the page containing this category. In there I can see the title of my article just linked under the correct letter but the page itself appears in Edit view and the following message appears:  Remember that this is only a preview. Your changes have not yet been saved! → Go to editing area

MY SYSTEM


 * MediaWiki: 1.22.3
 * PHP: 5.3.3 (apache2handler)
 * MySQL: 5.1.73

Can anybody help me?

Thanks in advance!