1. Changes not displaying after saving
    You may need to refresh your cache after updating and saving your pages:
    1. Configuration > Development: click on "Performance"
    2. Click on "Clear all caches"
    3. Refresh your browser to see if your changes are now displaying correctly.
    4. Certain browsers may hold an instance of your site in cache even if you've cleared your Drupal cache. If you are still not seeing your changes displayed correctly, try refreshing your browser cache or resarting your browser.
  2. WYSIWYG editor not displaying in edit mode
    When in edit mode, be sure the Text format drop-down menu below the text edit window is selected for Full HTML. This will deploy the more complete text editor options above the window, showing icons for common tasks such as adding lists, indents, images, and hyperlinks.
  3. Drupal mangling your html
    Drupal may mangle your html when you are creating custom code. It may mix up your intended order of <a href> and <div> tags or add extraneous </br> or &nbsp; tags. Your code may look fine when you save it but if it doesn't work and you go back in to fix it, you discover it isn't what you saved. To solve:
    1. Configuration > Text formats > Add a text format
    2. Name it “Non-formatted html”
    3. Under roles, check “Administrator” and “Content manager”
    4. Under Enabled filters, uncheck all except  “Correct faulty or chopped-off html”
    5. Save
    6. Navigate to the block in which you are experiencing the problem: Structure > Blocks
    7. Click on “Configure” in the right column, and select “Text format: Non-formatted html.” This will allow you to write your custom html into the Drupal field and leave it as displayed.
    8. Save
    9. Check to see if this cleared up your problem. Refresh or clear your site cache if needed.