Windows 7 may exhibit connection issues, or display issues when connecting to RemoteApps using the old 7.1 client version.
To check your Remote Desktop version, click the Start button and search for Remote Desktop. Launch the Remote Desktop program, click the icon at the top-left of the window, select About. This will show you your current client version (7.1, 8.0, or 8.1).
If you are not running version 8.1, upgrade the RDP client to version 8.1 following the path below.
Download and run all 3 files linked below, in this order:
Reboot your PC when done with each update.
Try logging into your RemoteApp after all updates are complete.