The said positioning problem with QTR under win10 only arises when using the comma as the system-wide decimal character, as in the majority of the European countries. My tests suggest the following explanation.
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If the OS is set to use the decimal 'comma' the QTR GUI can handle the top and left input data (inch or mm units) properly and the preview on screen shows the correct position of the image on the paper sheet, suggesting all is o.k. But when the GUI communicates the input position data to the core of QTR then all units are converted to inches and only the decimal 'point' is accepted internally. As a result the positioning data are truncated to integer multiples of one inch and the image is printed correspondingly (in general differently from the preview).
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Therefore, an accurate specified positioning of the image on the paper is only achieved if the system-wide decimal symbol is the decimal point. The size of the image is never affected, because it must not be specified in inches or mm in the GUI.
Hendrik Kuhlmann