I think you need to qualify what you are reporting....
If you import a shape file that is of a 10cm cube....and then double-click on the part to view its details and the size is not 10cm x 10cm x 10 cm or the scale values are not all 100%.....then you have a scale change set up on your importing.
If when printing, the cube measures 3-4% less that 10cm cube....then either you have used the new version of the default settings for your printer, and the calibration is somehow different, or the new settings are sufficiently different to cause the part to be printed undersize.
btw....none of these causes are bugs in the software, but are differences in the settings between what you used to use and what you are using now. All you need to do is identify what has changed....and adjust things to counteract the differences, etc.