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It seems you're right.

But indenting of and spacing between paragraphs together makes no sense.

This made a lot of sense to me. I did use \paragraph as a sectioning command, to separate topics in my texts. However, the topics didn't warrant titles, so I'd always use \paragraph{} to obtain an ...

Just saw your reply, but have to run out.
Have to think about this... seems I've been doing something wrong for years.

I wonder how an empty line can have indentation.
Ah yes, poor choice of words. What I meant is the indents of the first line of paragraphs created by (a) the command \paragraph{}; and (b) an empty line in the .tex; are of different lengths.

In my document, the following code

\paragraph{}
Lorem ...

Hello

I'm having quite an annoying problem in the thesis I'm writing: the indentation lengths of \paragraph and empty lines are different.

Some of the packages I'm using: lscape, subfig, caption, fancyhdr, titlesec, makerobust, changepage.

I realise this may be a bit of a long shot without ...