Flash Player 10.3.181.22 and 10.3.181.23 don't display PPT or PPTX files in the Share pod in Adobe Connect 8.x. The Share pod displays the Loading screen indefinitely. This issue is fixed in Flash Player 10.3.181.26.
Do one of the following, either install Flash Player 10.3.181.26 or higher (recommended) or install the Adobe Connect 8.1.1 Add-in.
The next time you join an Adobe Connect Meeting room, it uses the Adobe Connect Add-in. Then, you can see PPT and PPTX content in meetings and when playing back recordings.