Table boundaries menu changed

I used to enable menu option in Table → Table Boundaries when I wanted to hide invisible table borders. It was great option because I was able to hide invisible borders I use only as a help to create document, but all other borders are visible.

However, this changed (LO Now, when this menu item is enabled, borders on all tables are invisible. How can I use the old option?

I think that you mean “disabled”.

That’s fixed in LibreOffice 4.2.4,

see: All Border lines from tables are disappeared after Install of LO4.2.3.