Typing text into edit box, line terminated by pressing the Enter key

More text, line terminated by pressing Shift-Enter
More text

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The results of this test are exactly the same on the DAZ forum (i.e. Enter adds a blank line, Shift-Enter doesn't)

On the Hivewire3D forum neither Enter nor Shift-Enter add that spurious blank line.

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If I cut-and-paste from any of the 3 forums (Renderosity, DAZ or Hivewire) and paste to Notepad++ the EOL character is the  CR-LF pair because I'm using Windows

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The 3Dcheapskate* occasionally posts sensible stuff. Usually by accident.
And it usually uses Poser 11, with units set to inches. Except when it's using Poser 6 or PP2014, or when its units are set to PNU.

*also available in ShareCG, DAZ, and HiveWire3D flavours (the DeviantArt and CGBytes flavour have been discontinued).