404 Not Found error in Menu Editor

[JoomFX]

Some users get this error when they click on the "Apply" button for any Menu Item.
For me it was only reproducable with Dropdown Menu items but now I can also reproduce it with Top Level Menu items.

I reproduced the issue on an old installation updated to Joomla 3.4.0 as well as a brand new Joomla 3.4.0 installation.

[wbarnes]

I reproduced same error.
Latest Joomla install.
Unable to control drop down width.

[w00fz]

It would be helpful if you guys can catch what's the Ajax url that's being called when this happens. If you open the inspector and look at the Network panel you can get all the details regarding it.

[w00fz]

Actually I was able to reproduce it pretty easily in Joomla. I believe it's one for you @mahagr. It seems to fail at the /validate when applying and only for some items, some other works.
I think I narrowed it down to the menu items with type component. url and alias menu items don't fail for me.

[mahagr]

Alright, I'll talke a look on those tomorrow. Today I'm going to spend some time with my kids. :)

[thelaughingstockman]

If it helps, I had the same issue in Menu Editor but the icon picker worked fine with the social buttons.

[beamaria]

Same problem when trying to add an icon to the menu... 404 page coming up!

[w00fz]

Thanks guys we are able to reproduce it and on our way to fix it!

[mahagr]

@w00fz Can you check variable escaping in javascript as

&foo=bar&bar=baf

in any text field leaves the field empty and creates 2 new POST fields instead. Also make sure we do not have the same issue elsewhere.