Since you are seeing the WMP error/issue regardless of TCS platform, and the viewing in the web browser via SIlverlight seems to be fine, it could possibly be a client issue. Here is a post from a Microsoft support forum with some steps that can be done on the client that might help:
I got more or less the same problem as georg. the wmp stops after a while. In the wmp statistics (local player on tcs) i see the selcted bit rate drop, as well as the bandwidth in use.
checking the performance monitor of the windows media services on the tcs i see al lot of late reads and late sends. even with no client connected i get a lot of late reads. also the current file read rate every now and then drops to zero. is that normal behaviour of the tcs encoder?
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Over the last few months, I have had the privilege of working on SI...
Are you getting this error “Installer User Interface Mode Not Supported. The installer cannot run in this UI mode. To specify the interface mode, use the -i command-line option, followed by the UI mode identifier. The value UI mode identifiers...