Blank page on upgrade from 2.1.4 to 2.2.x

Me too having the same problem with my web app....please help

Did you modify php.ini and the codeignitor error log toggle to show you the error reports? If so, what errors come up? Is it the exact same problem (2.1.4 works but 2.2.2 or 2.2.0 don't)?

If you are on a hosted service provider then you may not be able to access the php.ini for the installation but you can put a php.ini in your root directory and override the error logs there.