Hi, me again...
Just for start, I´d like to say that this is the best editor for NSDialogs available.
So lets to the problem.
I´ve playing with some dialogs, and have noticed that after set size to 1044 and placed some controls, hitting test compiling and then the compiled dialog pops, they're different!!
So, I done some testing, and saw that this behavior occurs when using DLU to size and place controls (default) .
I got some time reading... and found this link...
So, I adapted the sample code from here http://nsis.sourceforge.net/Get_text_dimensions
to convert pixels units to dlu and voilá, the size and positions are equal.
Hope you can fix it, if more tests needed please ask.