HP QC Connector versions 4.8.0, 4.8.1, 4.8.2
This is caused by a bug in how the connector handles attachments in work items from QC.
This issue was resolved in the 4.8.3 version of the connector.
Please contact support to have this version supplied.
It will be necessary to upgrade the existing connector by unpacking the connector files and rerunning 'ruby install_gems.rb'.