Comment 1 for bug 583746

Thank you for reporting this problem.

The visual display of the disk seems to consistently disappear when enough operations have been added to the queue so that a scrollbar is required (about 4 operations).

I have been able to prevent this from happening if I comment out the following lines in HBoxOperations.cc::load_operations:

 //make scrollwindow focus on the last operation in the list
 if ( liststore_operations ->children() .size() > 0 )
  treeview_operations .set_cursor( static_cast<Gtk::TreePath>( static_cast<Gtk::TreeRow>(
     *(--liststore_operations ->children() .end()) ) ) ) ;

Currently in the git respository these can be seen at the following link:
http://git.gnome.org/browse/gparted/tree/src/HBoxOperations.cc#n76

Interestingly, if I change the "set_cursor" method to a "scroll_to_row" method, then this problem does not occur for an additional 2 operations (about 6 operations total).

The exact cause of this problem is still a mystery.

As a side note, a similar problem can occur when undoing many operations.