Versions of Safari 6.1 and higher run the Silverlight extension in Safe mode, disallowing file system access.

Follow these steps in Safari to fix the issue:
1. Navigate to [site] and login (error will appear).       
NOTE: [site] is your specific GIFTS Online site.
2. On the Safari Menu click Preferences
3. Select Security from the tabs and click Manage Website Settings
4. Select Silverlight from the list of extensions
5. Select [site] from the list of websites.
6. Select Run in Unsafe Mode from droplist
7. Click Trust
8. Click Done