Writer hangs when you select text in a table in a big cell with the text broken into two pages in the presence of fixed header.
1. create new table, columns 2, rows 2, with Heading
2. in header write one line of text
3. in second line write big fragmet of text, so that text in second cell transferred to second page

When you select fragment of text in neighboring pages in one cell selected fragment jump chaotic and in some cases Writer hangs and mouse blocking.

Kubuntu 10.04, LibreOffice Writer LibreOffice 3.5.3.2 Build ID: 350m1(Build:2)
same issue in OpenOffice