The URL for a presentation can vary slightly depending on the account the link came from. If allowed in the presentation settings, any user with viewing permission to a piece of content will have access to the share or link button for that presentation in their Home tab. This allows them to gather a direct link to the content.
Brainshark will recognize the user who is logged in and the zPID (a presentation ID beginning with z) at the end of the link can vary based on this information. The zPID can be found at the end of the links in the examples below.
For example, the two links below link to the same presentation, however the ending of these links do vary because they were gathered by two different users.
The different links will all bring the viewer to the same content and will not impact reporting in any way.
If you need additional assistance, please contact Support.