Do you really mean "empty page" (that is, none of the portlets, nor the portal
header or navigation tabs are showing) or do you mean that your portlet's window is
empty?
The portlet window will expand to whatever height is necessary. IN other words, there is
no vertical height restriction.
Have you asked the browser for the HTML source of the displayed page? That might give some
clues as to what is going on.
The next thing after that would be to debug your portlet - it is probably causing this
problem.
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