nautilus+ftp ubuntu freeze when dialog box appear and dragging a file

Thank you for your bug. That's known upstream: http://bugzilla.gnome.org/show_bug.cgi?id=122688 and a GTK patch has been commited for it

Fixed with this upload:

 gtk+2.0 (2.10.7-0ubuntu1) feisty; urgency=low
 .
   * New upstream version:
     * GtkNotebook
       - Tab reordering is a less intrusive
       - Rendering fixes on win32
     * GtkTreeView
       - Column resizing works correctly in right-to-left languages
       - Many scrolling bugs have been fixed
     * GtkTextView:
       - Improved scrolling during DND.
     * GtkRecentManager is more robust against bad URIs
     * Print support:
       - The cups backend works with 'BrowseShortNames Off'
         in the cups configuration
       - Multi-valued options are properly passed to cups
       - Fix build with cups 1.3
       - A few IPP compliance issues have been fixed
       - Make the lpr backend work on BSD
     * Input methods:
       - GtkEntryCompletion works with input methods
       - The Thai input method has been replace by a functional
         Thai and Lao input method based on libthai
     * Accessibility support:
       - GtkMessageDialog sets accessible name role explicitly
     * Theme support:
       - The semantics of the gtk-color-scheme setting has been
         slightly changed. Values from rc files are still merged
         together, but the X setting just overrides the prior table.
     * GdkPixbuf:
       - gdk_pixbuf_loader_write() now closes the loader when
         returning FALSE, as documented
       - The BMP loader supports more BMP variants, including
         transparency and 10-bit channels.
     * Bugs fixed:
       - 122688 modal dialog popup + drag in progress = mouse freeze
         (Ubuntu: #58575)
       - 315732 gnome-session crash on login
       - 335622 Click Description field causes Evolution to crash.
       - 357050 Crash replacing \n\n with \n or undoing after paste
       - 359537 printing custom page
       - 373466 crash in Text Editor:
       - 388041 crash in Open Folder: nada
       - 390873 crash in Text Editor: I had just opened it up ...
       - 367529 gtk_combo_box_set_model(combo, NULL) generates warning wh...
       - 381499 xdgmime requires getc_unlocked, darwin 6 lacks
       - 349119 GtkUIManager crashes on wrong action names in an XML file
       - 363437 gnome-panel crash to gtkrecentmanager code (Ubuntu: #66189)
       - 366782 GtkTreeView "expand_all" can crash if a node's children a...
       - 374378 Crash as GTK tries to blink cursor in defocused spinbutto...
       - 381236 apps crash when using a mouse cursor theme as icon theme
         (Ubuntu: #69977)
       - 320465 gtk_window_parse_geometry is almost completely broken
       - 355350 Page Setup, Range and Copy information ignored
       - 387170 Fairly large leak in gtk+
       - 390159 printing with BSD lpr does not work properly
       - 64998 GtkEntry - gtk_entry_set_text emits "changed" twice
       - 92387 unfriendly drag-n-drop in textview - scrolls too fast
         (Ubuntu: #58345)
       - 172188 io-bmp.c should sanity check the size given by the OffBit...
       - 304482 GtkComboBoxEntry editable entry should be centered vertic...
       - 315440 Problem with gtkpaned inside gtknotebook(mouse wheel over...
       ...