4:3 or 1:33:1 are squerish frame videos and hence do not capture the full screen of the iPad. This has nothing to do with the App or the firmware of the Wireless Stick but the Aspect Ratio of the video. The password for the wireless Stick should be between 8-63 characters long and can have special characters. If you have issue you can directly contact SanDisk Support at 1-866-SANDISK.
Also, if you are trying to connect to via same iPad or iOS device it will not ask for the password again as the password is already saved for the device on iOS.
