Adobe Reader XI and SharePoint Online

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We are mapping SharePoint sites as drives for our users, which utilizes WebDav.  When users are opening documents that are digital signature enabled, it is prompting them to check in/check out or open, as expected.  However, despite which option is chosen to open the file, at the next step, they receive a message stating that the document is part of a workflow and must first be downloaded to a local location (see image).
When opening directly from the SharePoint site, the document opens as usual without any prompts, and without issue.  Has anyone else experienced this?  If so, how do we fix it?
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