Zoomtext magnification hotkeys capslock+up/down arrow do not work unless the Zoomtext program window is in focus.
This problem may be caused by anti-virus software. It has been observed to occurr with Kaspersky AV software. To fix the issue please add the following exclusions to the Threats and Exclusions in the Kaspersky interface.
c:\Program files (x86)\Freedom Scientific
c:\Program files\Freedom Scientific
c:\ProgramData\Freedom Scientific