Not sure about the capturing issue, but about the File Error issue, try this fix from Avid:
1. Click on the system (Macintosh HD in most cases) drive to highlight
2. From the File menu select Get Info (cmd+I)
3. Click the lock icon in the bottom right to make changes
4. Click on the “Read only” text in the Privilege column next to Everyone (also check the [Me] column) and set the privilege to “Read & Write”
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