if a document is divided in columns in some cases text is shifted leaving blank 
space - sometimes small sections but mostly these blank spaces span several 
pages. some of these get filled by the text if the document is left open and 
focused on them (probably repagination etc), but most just stay like that - and 
they also get printed like that. screen repainting doesn't help.

it seems that this problem usually happens when pgup/down is used to scroll 
columned doc. using cursor keys renders document ok. (yes, i did hold down in 
attached document till botoom :) ).

how to reproduce :
open attached sxw, press ctrl+end and then scroll up with pgup. (there are blank 
sections also when using pgdown from the start, so this is not a problem with 
going to bottom first etc).