I have a Roku LT 2450x on which I have used Roksbox for years with zero issues. On April 15 the box received the update to system 7.1.0 build 4062. Since then when watching a video in Roksbox, the following message is displayed on the screen as the video begins to play: Format Detected. There is also an "OK" button displayed with the message. The video starts and plays behind the message as though all is normal. I have to click "OK" to clear the message and then everything is fine. If I fast forward or rewind a video, the message is displayed again as the video starts playing from the new position. Pausing and resuming works normally, no message. If I select "Play All" for a directory of videos then the message appears as each progressive video starts to play, requiring a click on "OK" each time to clear the message.
I've searched the forums but haven't found any mention of this behavior. I could live with it for watching longer videos but we often use "Play All" to view snippets of our own home videos. It gets a bit aggravating having to deal with it every few minutes, especially after years of trouble-free service.