Dear Customer,
1. If Uploader detects SilverLight is installed on your PC, It will use the SilverLight solution.
2. If Uploader detects Flash is installed on your PC, It will use the Flash solution.
3. If Uploader detects Iframe is supported on your Browser, It will use the Iframe solution.
4. Uploader will render as default upload control.
If you want to use multiple files upload, you need install silverlight or flash 9+, flash 6 is not supported.
Please check whether silverlight or flash has been installed in your second computer.
Regards,
Eric