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					Originally Posted by  Kast
					 
				 
				problem happens in both the original and PRS+ firmware. Is there a solution about it? (the problem is only recreated when I choose Medium or Large Fonts on the reader) 
			
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 This is obvious, as a PRS+ modified reader is still using the original Sony-programms to render content.
Your problem is caused by the reflow-mode, while font-size is set to something other then "S". As you have access to the sources, you should try to create "pure"-text PDF's without including the scanned bitmaps into the resulting PDF-file. (As recommended by elcreative in the post you mentioned)