Trying to rename a nav label and causing screen freeze!

Trying to rename a navigation label.

As the WP Admin (brand spanking new), I went to Menus -> Primary (the one I’m using) -> Selected the third of 7 Pages and tried to rename it from “Fund Accounting” to “Emerging Managers”. The entire program froze, as did Mozilla.

So I tried another way. I went to Menus -> Primary -> Selected the third of 7 Pages and removed it. I then went to Add Items -> Pages -> Categories -> Uncategorized and it added the Uncategorized to the bottom of the Menu list. I then still have 7 menu items (pages)

Then I clicked “Reorder” and the arrows showed up. The minute I tried to use the “up” arrow more than two times, the entire program froze, again, including Mozilla.

I finally was able to do it by just renaming the “Fund Accounting” to “Roadmaps” and then I’ll delete the detail on that page, but I’d rather not. May want to use it another time..

Anyone have any ideas? Am I trying to change the navigation label in the wrong place?

Thanks, in advance, for any help you can give me.