I use cs6, and only reason I mentioned I do magazine is because I want to state that this little nuisance is actually really important for me atm, I got only this weekend to finish this and it would be sad to do it in Word.
Strange! Maybe the doc is having problems. If you create a new document, put some text in it (which should appear as Align left by default) and then click the Control Bar button for Justify with Last Line Aligned Left, does it work?
No, not strange at all. InDesign just do what you ask it to.
“Left Justify” means that the last line is adjusted left. If all your lines end with a hard return, that line is seen as “last” – and there for adjusted left.
“Left justify works on a hwole paragraf, not a single line.