Differnt versions, different line-spacing

I have a document, written using LO 4.2.82 on Ubuntu 14.04. The bulk of the document uses a paragraph style which has the line spacing set to 180%. Actually what I want is 1.5 line spacing, but if I select this the result is way too close to call 1.5. So be a process of experimenting I’ve established that 180% gives me something that looks about right.

If I open the same document in LO 5.1.5.2 on Windows 10 what I get actually looks like 180% line spacing. Can anyone suggest what is causing this?

Just to make things even more complicated, whilst I can reproduce this effect, I can’t reproduce it consistently. A new document I created as a test this morning seems to display similarly in both versions, with 1.5 line spacing producing the effect I’m after.

Do you have the required fonts installed on each machine? Have you experimented with embedding the fonts into the document (File / Properties)?

Yes, line spacing is relative to a font size and type. LibreOffice 4.2 is quiet old, maybe LO changed default template since then.

Yes, the font is installed on both machines. The template is not default, though it may have been based on the default template originally. Oddly, if I create a new document from the template I have the problem. If I create a new document from the default template, and then apply this template, I don’t. This doesn’t help with my immediate problem though, which is that I have a 45,000 word document that will eventually be twice that size and I need to be able to work on it across both machines

Possibly template corruption then. I would create an alternative template and experiment from there. I also would update LO. The new schema does not “apply” whole other templates to existing documents, it “loads” specified elements from them.