Apply these registry keys to help clear up some of the current RDP display bugs in RemoteApp.
From an elevated Command prompt:
REG ADD "HKLM\SOFTWARE\Policies\Microsoft\Windows NT\Terminal Services\Client" /v fClientDisableUDP /t REG_DWORD /d 1 /f
REG ADD "HKLM\SOFTWARE\Policies\Microsoft\Windows NT\Terminal Services\Client" /v EnableHardwareMode /t REG_DWORD /d 0 /f