You can get faster response for PowerPress issues at the blubrry.com forums, forum.blubrry.com.
The plugin you reference "Tweet, Like, Google +1 and Share" hasn't been updated since March. I would ping them and just double check they are still actively developing the plugin.
If the plugin is still actively developed, have the developers contact me. This problem is usually caused by themes/plugins calling get_content/get_excerpt and related functions from outside of the "Loop". If the developer(s) of Tweet, Like, Google +1 and Share is interested in fixing the issue, have them contact me, I'll gladly send them more details. Contact cio [at] rawvoice dot com.