See http://www.mackichan.com/techtalk/395.htm for information on adding a page break.  The article refers to the table of contents (toc), but the same technique works for the list of tables (lot) and list of figures (lof).

A newpage object should start a new page.  The only exception is that a newpage at a location that already starts a new page will usually be ignored.  This can be fixed by adding a required object (white space of some type, either a required horizontal or vertical spacing object) before the page break.  If you continue to have difficulties, then you will have to post an example that shows the problem.