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There could be several reasons why the cursor control and Enter key in Rubymine do not function properly on a remote host:

1. Network connectivity: If the network connectivity is poor, the remote host might not be able to receive the cursor control and Enter key commands in a timely and accurate manner, leading to a malfunction in Rubymine.

2. Server configuration: The server configuration might not be set up properly to allow Rubymine to function correctly. Check if the server has the necessary Ruby and Rubymine dependencies installed and configured.

3. Keyboard configuration: Your keyboard could be configured incorrectly for the remote host. Make sure your keyboard layout matches the remote host.

4. Rubymine version: If you are using an old version of Rubymine, it might not function correctly with the remote host. Ensure you have the latest version of Rubymine installed.

5. Permissions: Check if you have sufficient permissions to run Rubymine on the remote host. If not, contact the system administrator.

To resolve the issue, try the following troubleshooting steps:

1. Check your internet connection to ensure it is stable and fast.

2. Verify the server configuration settings to ensure that Ruby and Rubymine dependencies are installed and configured correctly.

3. Check your keyboard settings and ensure they match the remote host. Try switching to a different keyboard layout in your local environment.

4. Update your Rubymine application to the latest version.

5. Check your permission level on the remote host to ensure you can run Rubymine.