When using PLAXIS 2D AE and PLAXIS 2D Classic on Windows 8.0, Windows will show an error message when closing the Input-applications:
This error message does not affect the saving of your project, and when reopening the project everything will be fine. So, it is safe to ignore this specific error message.
This problem has been solved in the Windows 8 Service Pack: when updating to Windows 8.1, this problem will not occur anymore.
For Windows 8.0, this issue can also be solved by making sure PLAXIS 2D AE.01 is installed with the latest CodeMeter drivers.