iOS Simulators missing

Hi all,

I'm trying to port an old application to the new iOS8, due to compatibility issues requested by users. The app was developed with Titanium Studio and is on the stores since end 2011 and I have not updated it since january 2012. In the last days decided to reinstall Titanium on Mac, updated to 3.4 beta with some trouble (now 3.4 stable), installed xcode 6.01.

Surprisingly I did not have hard troubles making the old app work on my real device, but it seems that I made a mess with installation because if I select the last sdk I loose all the simulators output. They are simply not present in the menu next to "Run" command. The simulators are present if the sdk 3.3 is selected but they don't output anything, throwing out an error (and this is somehow expected since it wasn't working with xcode 6).

For completeness, the xcode 6 simulators are perfectly working with other frameworks or from xcode tools.

These are the console logs:

SDK 3.4GA with simulator forced run from "Run Configuration" menu:

Titanium Command-Line Interface, CLI version 3.4.0, Titanium SDK version 3.4.0.GA
Copyright (c) 2012-2014, Appcelerator, Inc.  All Rights Reserved.
Please report bugs to http://jira.appcelerator.org/
Available iOS Simulators:
8.0
  B74F99B5-C116-425B-9454-930E2B83146C  iPhone 4s
  1F146D6F-81A0-4C59-87E3-D84419091032  iPhone 5
  5C80A4C0-2D60-41DE-A7F9-0ED6D242D811  iPhone 5s
  8CE907D3-473D-486D-AC40-44648C208F1C  iPhone 6 Plus
  CEFD692C-2B9A-47DB-A4B6-964589EB559B  iPhone 6
  EACBC71A-385F-4336-AF3E-5A0288BA5BC6  iPad 2
[ERROR] :  Invalid "--device-id" value "iPad"
  5C0143FE-CDE8-42F4-8860-C6CC33F58B5C  iPad Retina
  495B2271-FA7C-4196-A9C4-EAA308696FF0  iPad Air
  246D32C1-A771-4629-9CC5-FCD70A1DCDB3  Resizable iPhone
  6D5DB6A1-73EF-4849-B6F6-A38A2B99A9B4  Resizable iPad
7.0.3
  04B03946-5C55-46AE-9286-37726B480ED0  iPhone 4s
  795B992C-9530-4B0F-A410-BB8E20372F78  iPhone 5
  160F25F3-638C-49EF-9868-9722FEB7D703  iPhone 5s
  4304B930-7FD3-486E-91ED-BCB536075F55  iPad 2
  8CB96EE2-9FD2-4B5D-8AB5-D2240A75DFEA  iPad Retina
  6A9B2D70-3194-45ED-BB4A-87CF68347331  iPad Air
For help, run: titanium help build

SDK 3.3GA with simulator selected from standard menu:

Titanium Command-Line Interface, CLI version 3.4.0, Titanium SDK version 3.3.0.GA
Copyright (c) 2012-2014, Appcelerator, Inc.  All Rights Reserved.
Please report bugs to http://jira.appcelerator.org/
[ERROR] :  There are no supported Xcode installations found.

Should I reinstall everything? I just tried to delete and reinstall Studio but it seems that something remains in the Mac and the problem is the same. How can I make a TRUE CLEAN reinstall of Titanium, mobile sdk's and any other sensible file?

Thanks