I am using Atahualpa 3.4.6 at my site, and I was trying to do some work on it. Not sure what I did, but suddenly the menu bar is gone. The attached image shows how jumbled up it is.

I've looked in ATO under Page Menu Bar and also in my WP Dashboard menu (wp-admin/nav-menus.php) and cannot find anything that allows me to restore it to its right function. Any suggestions?

Also, is there an advantage to upgrading to the Atahualpa 3.7.10 from my current version of 2.4.6? I'm a non-techie, and am intimidated by the prospect of backing up the database and wp-config.php and wp-content folders.

Thanks for your help.

Are you pointing to the menu in Appearance>Menus?
Kind of hard to tell you what to look for without knowing what you did. As for upgrading to 3.7.10 I wouldn't be too concerned at this point. If you do decide to upgrade the only things you need to think about are images you have added to the atahualpa/images folder and sub-folders. Those need to be replaced. Also if you used and php in the theme options that will not work with 3.7.10 as well.

Yes, I got to the WP menu by going to "Appearance" then "Menu". There used to be a menu bar with drop-down menus. I've attached a pic of the menu layout in WP. What did I do? I was trying out a portfolio-based theme. Looked awful, switched it back, and the menu was messed up.

Thanks for any guidance you can provide.

So are you saying that what is in the screen shot is not there now?

Both screen shots are current. I.e., that's what the homepage looks like, and that's what the WP Menu page (/wp-admin > Appearance > Menu) looks like.

Do you have the menu associated properly on the left?