You said you registered it because you transferred a PS1 game, but did you register it under remote play?
PS3= Settings->remote play settings->register device
It's different than the content manager.
Edit:
Registering your PS Vita system with the PS3™ system
Perform this procedure with your PS Vita system near the access point.
<dl class="num"><dt class="bol">1.</dt><dd>On the PS3™ system, select
(Settings) > [Remote Play Settings] > [Register Device] > [PS Vita System]. A number appears on the screen.</dd><dt class="bol">2.</dt><dd>On your PS Vita system, tap
(Remote Play) > [Start] > [Next].</dd><dt class="bol">3.</dt><dd>Enter the number displayed on the PS3™ system's screen, and then tap [Register]. When the devices connect successfully, a message indicating that the registration is complete appears.
If the Wi-Fi Settings screen appears, select the access point that is connected to the PS3™ system.</dd><dt class="bol">4.</dt><dd>Select [OK] on the PS3™ system.</dd></dl>

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