Using Ubuntu 14.04, LO 5.0.05 Build ID: 00m0(Build:5) After starting writer, when I try to change the width of side panel by dragging, it show erratic behaviour changing between old and new size. Cursor freezes and it freezes use of mouse in other programs too. Luckily keys keep working and you can force terminate writer by pressing alt+F4 a few times. It does not happen in Calc or any of the other LO-applications.
*** This bug has been marked as a duplicate of bug 93134 ***