3.11. Why is there a white box covering my page in edit mode (LINUX)?

The version of flash that you currently have installed does not support transparency.  This is likely because you are using the open source version of flash that came with your linux distribution.

To fix this:

1. Remove the flash package you currently have installed.  If you are using Ubuntu, you can use this command: 

sudo apt-get remove flashplugin-nonfree

2. Visit Adobe’s download page, select the appropriate download, and install the package.

3. Restart your browser.