I have been using a software called OctoPrint that allows you to control your printer in your Browser. For sake of simplicity I have used Octopi, a preinstalled image with OctoPrint, but now I would like to make some changes, and I decided to build OctroPrint by myself, the instructions for building it are here: https://github.com/foosel/OctoPrint/wiki/Setup-on-a-Raspberry-Pi-running-Raspbian. The problem is that when I follow the first commands:

sudo apt-get update
sudo apt-get upgrade
cd ~
sudo apt-get install python-pip python-dev python-setuptools python-virtualenv git libyaml-dev build-essential
git clone https://github.com/foosel/OctoPrint.git
cd OctoPrint
virtualenv venv
./venv/bin/pip install pip --upgrade
./venv/bin/python setup.py install
mkdir ~/.octoprint
sudo usermod -a -G tty pi
sudo usermod -a -G dialout pi

And then I start the octoprint server

 ~/OctoPrint/venv/bin/octoprint

The webpage of Octoprint freezes

I don't know if this is fixed in later commands, but I would like to get a sense of how all fits together before continue. It doesn't look that is the browser (I am capable to visit other websites without any problems), so is maybe Octoprint? How can I fix this? Did anyone have this problem before? Thanks in advance

The output in the console is:

2016-07-11 03:09:19,442 - octoprint.server - INFO - Starting OctoPrint 1.2.13 (master branch)
2016-07-11 03:09:19,502 - octoprint.plugin.core - INFO - Loading plugins from /home/pi/.octoprint/plugins, /home/pi/OctoPrint/venv/lib/python2.7/site-packages/OctoPrint-1.2.13-py2.7.egg/octoprint/plugins and installed plugin packages...
2016-07-11 03:09:20,522 - octoprint.plugins.discovery - INFO - pybonjour is not installed, Zeroconf Discovery won't be available
2016-07-11 03:09:20,524 - octoprint.plugin.core - INFO - Found 6 plugin(s) providing 6 mixin implementations, 3 hook handlers
2016-07-11 03:09:20,533 - octoprint.filemanager.storage - INFO - Initializing the file metadata for /home/pi/.octoprint/uploads...
2016-07-11 03:09:20,536 - octoprint.filemanager.storage - INFO - ... file metadata for /home/pi/.octoprint/uploads initialized successfully.
2016-07-11 03:09:23,615 - octoprint.util.pip - INFO - Found pip at /home/pi/OctoPrint/venv/bin/pip, version is 8.1.2
2016-07-11 03:09:23,620 - octoprint.plugin.core - INFO - Initialized 6 plugin implementation(s)
2016-07-11 03:09:23,625 - octoprint.plugin.core - INFO - 6 plugin(s) registered with the system:
|  Announcement Plugin (bundled) = /home/pi/OctoPrint/venv/lib/python2.7/site-packages/OctoPrint-1.2.13-py2.7.egg/octoprint/plugins/announcements
|  CuraEngine (<= 15.04) (bundled) = /home/pi/OctoPrint/venv/lib/python2.7/site-packages/OctoPrint-1.2.13-py2.7.egg/octoprint/plugins/cura
|  Discovery (bundled) = /home/pi/OctoPrint/venv/lib/python2.7/site-packages/OctoPrint-1.2.13-py2.7.egg/octoprint/plugins/discovery
|  Plugin Manager (bundled) = /home/pi/OctoPrint/venv/lib/python2.7/site-packages/OctoPrint-1.2.13-py2.7.egg/octoprint/plugins/pluginmanager
|  Software Update (bundled) = /home/pi/OctoPrint/venv/lib/python2.7/site-packages/OctoPrint-1.2.13-py2.7.egg/octoprint/plugins/softwareupdate
|  Virtual Printer (bundled) = /home/pi/OctoPrint/venv/lib/python2.7/site-packages/OctoPrint-1.2.13-py2.7.egg/octoprint/plugins/virtual_printer
2016-07-11 03:09:23,628 - octoprint.filemanager - INFO - Adding backlog items from all storage types to analysis queue...
2016-07-11 03:09:23,639 - octoprint.filemanager - INFO - Added 0 items from storage type "local" to analysis queue
2016-07-11 03:09:23,644 - octoprint.server - INFO - Reset webasset folder /home/pi/.octoprint/generated/webassets...
2016-07-11 03:09:23,660 - octoprint.server - INFO - Reset webasset folder /home/pi/.octoprint/generated/.webassets-cache...
2016-07-11 03:09:24,082 - octoprint.plugins.discovery - INFO - Registered OctoPrint instance on raspberrypi for SSDP
2016-07-11 03:09:24,095 - octoprint.plugins.pluginmanager - INFO - Loaded plugin repository data from disk, was still valid
2016-07-11 03:09:24,135 - octoprint.server - INFO - Listening on http://0.0.0.0:5000
2016-07-11 03:09:24,602 - octoprint.plugins.announcements - INFO - Loaded channel _important from http://octoprint.org/feeds/important.xml in 0.43s
2016-07-11 03:09:25,271 - octoprint.server - INFO - Preemptively caching / for {'query_string': 'en', 'path': '/', 'base_url': 'http://0.0.0.0:5000/'}
2016-07-11 03:09:59,143 - octoprint.server.util.sockjs - INFO - New connection from client: 127.0.0.1
2016-07-11 03:09:59,884 - octoprint.plugins.cura - INFO - Path to CuraEngine has not been configured yet or does not exist (currently set to None), Cura will not be selectable for slicing