When saving the settings using Tools->Options you may see an error:
"Cannot create a file when that file already exists."
This may be due to your anti-virus program.
Specifically, we have seen error when McAfee Real-Time Scanner is active.
To resolve this issue, add the following file to the Excluded File list in the Anti-virus software:
%APPDATA%\Liquid Technologies Ltd\Liquid XML Studio 2015\UserSettings.xml