Unfortunately, we could not reproduce the issue. Could you please clarify if you have the FPS value set to 1 in the Connection properties for a specific remote Host machine or in the Default connection properties? In addition, please let me know what version of Remote Utilities do you use?
To reproduce the issue: In the online address book > right click on a remote machine > Properties > Color and CPU > I can only set the color format and CPU usage and save. The FPS value 15 is gray and i cannot set the FPS here.
What I have to do is: Double click the online machine in full control mode > In the control windows > right click > Properties > Color & CPU > set the FPS to 1 > Apply & OK.
Close the control windows and then re-connect again the same machine, you will find that the FPS is returned to 1 again.
Could you please confirm if I'm right in assuming that you're setting the FPS value in the Color and CPU window that you invoke on the toolbar in the Full Control window?
If this is the case, please try setting the FPS value in the Connection properties window that is invoked in the main Viewer window (i.e. from the address book). The FPS value is greyed out if the CPU usage is set to any other value than FPS. Please try setting the CPU usage value as FPS and then changing the FPS value itself. In this case, the FPS value is saved for this remote Host.