This may have happened after a graphics driver update. We suggest to disable hardware decoding on the client. First exit the Player on the machine you are connecting from by right clicking on the !M icon in the sytem tray and clicking Exit Player.
Edit %USERPROFILE%\.nx\config\player.cfg and set:
<option key=”Enable hardware accelerated decoding” value=”false” />
Then create a new session and check if it helps.
If not, set that key to:
<option key=”Enable hardware accelerated decoding” value=”disabled” />
and create a new session.
The first setting disables the use of HW decoding but the codec library is still loaded, while the second settings
disables completely the HW decoding and cannot be set via UI.
Let us know result of tests. If it works, it would be useful to know some hardware details so we can investigate internally. Which is the client side computer model, the graphics adapter name and the driver version?