When you log into the PowerPoint Mastery Program,  you had to manually navigate back to the section you were working on before. 

To help you get back to where you were quickly, do this after you login to the  Mastery Program: 

Click on the 'Resume from Previous Topic or Lesson" button. You will be directly taken to the topic or lesson you were previously working on.

If you were logged in for a while, you may have been logged out the background by the browser.
In case you face this issue again, please try logging out and logging in again.

In the login screen, check the "Remember Me for 2 weeks" box. this will prevent this issue from coming up again.

If you are encountering speed, upload, download, or various interface problem it could be caused by a plugin, add-on, or extension that you have installed in your browser.

To see if this is the case you can try disabling all plugins, add-ons, or extensions within your browser.
Here are steps for various browsers:

Mozilla Firefox:
Click the orange "Firefox" button in the top left-hand corner of the browser window and choose "Add-ons" from the right column of the menu to open an Add-ons Manager tab in the active browser window.
If you are using Windows XP, click on "Tools" from the menu bar near the top of the browser window and choose "Add-ons."
Click "Extensions" to view the installed extensions that add features to Firefox, or click "Plugins" to view plugins that add compatibility and functionality.
Find the add-on you want to disable and click its "Disable" button.
If you want to delete an extension entirely, click "Remove."
Restart Firefox to complete the process.


Google Chrome:
Click the menu icon "=" at the top right of the browser window, choose "Tools" and choose "Extensions" to open a new "Options" tab.
Uncheck "Enabled" to disable an extension, or click "Remove" to delete it completely.
Enter "chrome://plugins/" in Chrome's address bar to view plugins that add compatibility and functionality, such as Apple QuickTime or Adobe Flash,
Click the "Disable" link under the plugin you want to disable.


Safari:
Choose Safari > Preferences.
Click the Security pane.
Click Manage Website Settings to see plug-in details for a particular website.
Internet plug-ins installed on your computer appear on the left side of the plug-ins sheet. Select a plug-in to configure its website settings.
Websites that are currently open in Safari appear on the right side of the plug-ins sheet. Websites that you have already configured by clicking "Trust" or "Cancel" also appear here.
You can select Ask, Block, Allow, Allow Always and Runs in Unsafe Mode under "When visiting other websites:". Select Block to disable plugin and Allow or Allow Always to enable.