Custom Menu Sidebar

Good morning.
When I create a post, I assign a specific sidebar, and when I update that choice disappears.

On the other hand, I have several different custom sidebar menus. But it only saves me one.
Can you give me some solution to this issue, please?

thanks

hi,
i have created a post,
then created a sidebar,
then I went to widgets area and added a widget on my newly created sidebar : http://screencast.com/t/lBWKSORtNseW

then assign the new sidebar to the post : http://screencast.com/t/gAjRwrrslwG

then save the post.

the result : http://screencast.com/t/S5L5j0v0

Thanks for you message.
Radu A.

It works.

When I assign it to different pages sidebar is where the problem appears.

I have 5 different sidebars, each one with a custom menu.
When I assign each sidebar to a different page I have no problem.

When you return to make any changes to any of the pages, the relation between the sidebar and the page disappears, and if I do not look for, when you upgrade, the sidebar disappears.

Likewise, when I come back to check the widgets assigned to each sidebar, the menus have disappeared.

It is like if it not be saved in the database.

I have previously worked with a several wordpress templates and never have this issue.
Please, it’s pretty frustrating. Thanks