I have a new MU6020 that had this issue too. It was on software vers 1147 I think, and it didn't see any newer version when asked to search for an update. On Samsung's support page for the model, however, you can download version 1151 and install onto the TV with a USB flash drive. The download is an exe that extracts a disk image to the flash drive, so you'll need a Windows PC to hand. This has fixed iPlayer for me. I guess that an update will be rolled out to the TVs in due course. Good luck!
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