404 error on some nodes and user pages

Same with the .dev version.
Also, the admin page for qtabs seems to break and show weird settings.

Well what happens is that if I enable Quicktabs and View Content Panes, some users' pages won t show up (404 error) as most of nodes (some do others don t). In addition to that in the Quicktabs admin page, the quicktab content showing for each QT is not the right one (as if I have a view, it shows a block with a view name, weird) and if I click to choose the content for a QT it will choose that content for all the QTs).
Seems to be a wide problem with ajax..
Tell me if I can give further info or if you want/need a user to get into my page/database.
Thanks
Simone

Here you got a screenshot:
you see that the QT "Deporte" is a node but a view is chosen, same as with QT "Cursos" and QT "Museos".
If I click on any button, then it goes even wilder changing values for all QTs.
thanks
Simone

One more info: issue comes with the Zen theme, if I switch to Garland then there is no issue. That may be because QTs are loaded in the content-top region which doesn t exists in the Garland Theme.
Java is ok on the browser, seems like there is an internal problem with it, any idea what I can do for debugging?
thanks
Simone

I confirm that if I load the QTs on a Garland region then issue is back.
I l try to reproduce the issue from a clean install.
Simone

Hi
I checked with Firebug and quicktabs_form.js is properly loaded but I get this error

[Exception... "Component returned failure code: 0x80040111 (NS_ERROR_NOT_AVAILABLE) [nsIXMLHttpRequest.statusText]" nsresult: "0x80040111 (NS_ERROR_NOT_AVAILABLE)" location: "JS frame :: file:///Applications/Firefox.app/Contents/MacOS/components/nsBlocklistService.js :: anonymous :: line 615" data: no]
anonymous(Document add, "events", Object name=data)jquery.min.js?7 (line 19)
anonymous(Document add, Object name=types, Object name=handler)jquery.min.js?7 (line 25)
anonymous()jquery.min.js?7 (line 26)
anonymous(Object length=2312 0=html.js 1=head 2=meta 3=title 4=meta, function(), Object name=args)jquery.min.js?7 (line 21)
anonymous(function(), Object name=args)jquery.min.js?7 (line 12)
anonymous(Object name=type, Object name=fn)jquery.min.js?7 (line 26)
anonymous()jquery.min.js?7 (line 27)
anonymous(Object originalEvent=Event unload type=unload)jquery.min.js?7 (line 26)
anonymous(Object originalEvent=Event unload type=unload)jquery.min.js?7 (line 26)
anonymous()jquery.min.js?7 (line 25)
[Break on this error] var statusText = request.statusText;\nnsBlockl...ervice.js (line 615)

Simone