It sounds like you might have tweaked some settings that led to this. To fix the issue, please try the following:
1. Quit the RAM Disk application via
File - Exit in the main menu. It is crucial to use this way instead of closing the window with [X].
2. Open this file in Notepad: %ALLUSERSPROFILE%\SoftPerfect\RAM Disk\ramdisk.xml
and change the following line
<useraccess>false</useraccess>
to
<useraccess>true</useraccess>
3. Start the RAM Disk application again.