Yesterday I tried installing Chicago, and today Navy Pier. In both cases, it appeared to work, as I was able to write a post, but then my browser just went blank. I couldn't get the login page or any other page. There was no error message at all.
I deleted and went back to the Florida (stable) version, and all was well again.
Since it happened twice, with both new versions, I have to assume something was terribly wrong somewhere. When you can't get any error messages or screen images, there's just nothing else to be done but delete it.
It looked great from what I saw of the new version, just wish I could make it work.
Next time, please do look at the forum topic you are posting in. you should have chosen the 'Support' and not 'Plugins & Extensions'.
Your problem looks like a php memory shortage. Open ../blogs/conf/_advanced.conf.php and read from line 43 onward:
So uncomment ini_set('memory_limit', '16M'); and try again.
Good luck