News of the Day!
We figured it out!
Thanks to a Google search, we found a solution.
In Mozilla Firefox (where we had the problem), go to the menu button
(upper right), click on MENU. When it opens, click on ADD-ONS, then
on the left, click on PLUG-INS. Then, select from the list,
SHOCKWAVE FLASH PLAYER.
When it opens, un-check "Enable Adobe Flash Protected Mode."
Then, close Mozilla, then re-open it.
This solved The Problem. The Google search response said... Protected Mode
can cause playback problems, but don't de-activate it, if you don't have problems.