Hi..., why ThemeMagic preview doesn't work when sh404sef ON? It's work when OFF
You can duplicate the problem by:
1. Install T3 Quickstart for Joomla 3.3 (Joomla 3.3.3 - T3 Bs3 Blank 2.1.6 - T3 Framework 2.3.2)
2. Install sh404sef 4.4.4.1791
3. Select 'YES' for 'Enable URL optimization' in control panel of sh404sef
4. Check ThemeMagic preview
Regards