We need a lot more information to help. There are so many different things that could mean. It could mean that you see the apps, but when you launch them, there's a blank screen; it could mean you can launch an app, but it immediately crashes; it could mean the apps don't even show; and so on.
So, what is your Roku device and software version? Settings > System > About
Describe exactly what happens, what you are doing, and what happens along the way.
DBDukes Roku Community Streaming Expert Note: I am not a Roku employee.
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