1) qBittorrent no longer uses notify osd (libnotify) in Ubuntu, it shows the regular gnome notification in the tray instead.
2) The width of the column on the right side is not (always) remembered. To reproduce:
-- Have several torrents running so when you enable a tab at the bottom (General, etc.) you get a scrollbar for the torrents on the right but not otherwise.
-- Set the upper tab's width in a way that you don't have a horizontal scrollbar when the "General" tab is disabled.
-- Enable the "General" tab.
-- You should get both vertical and horizontal scrollbars.
-- Adjust the width of the column on the right (for me its "Ratio" since I disabled the last five) in order not to have a horizontal scrollbar.
-- Switch the tabs at the bottom on and off. You should not get a horizontal scrollbar.
-- Restart qBittorrent when the bottom panels are disabled.
-- Enable the bottom panels. You will get a horizontal scrollbar. If the panels are enabled when closing qB then it will work as expected next time.
3) Same thing happens to the Trackers and Peers panel.
4) In Preferences only the "Download" window has a horizontal scrollbar. Either the layout of this window or the default size of the whole Preferences window should be adjusted to remove this scrollbar.
5) On the exit confirmation pop-up window the "Yes" option is on the left despite of the fact that I use the "Gnome" look of qB. It might be intentional, though, I cannot tell.
6) The title of the window mentioned in 5) is longer than what can be shown and thus ugly. I think you should just rename the window to "Exiting qBittorrent".
You know, it's the little things that matter. :)
Reuploading a package to fix 1)
I'll look into the rest of the issues.