Problem with line-spacing

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Hi everyone,

I have a problem with 1.5 line spacing in my document. For line spacing 
1, the compiled pdf is excellent, but as soon as I change to 1.5 line 
spacing, the text exceeds the pages in the pdf. The style is report, 
paper size A4 and default margins are used (but a manual setting does 
not help either). What have I done wrong?

Thanks for any help,
Mareike