Public bug reported:

I run into this while using Qt-based Fleeting Password Manager (2.6) in
11.10. The problem can be reproduced when I minimize and maximize the
app, possibly a couple of times. After that the combobox showing saved
logins cannot be opened anymore. Its selection list is invisible. It
works again after restarting the app. This might be a problem in Unity
(or a Qt problem?), because I think that QComboBox tries to open a small
window when it's opened and for some reason that fails. The same version
of the app has worked perfectly on 10.04, 11.04 and on Windows 7.

Test program can be found in here: 
https://sourceforge.net/projects/fleetingpm/
 
$ lsb_release -rd
Description:    Ubuntu 11.10
Release:        11.10

$ apt-cache policy unity
unity:
  Installed: 4.22.0-0ubuntu3
  Candidate: 4.22.0-0ubuntu3

$ apt-cache policy libqt4-core
libqt4-core:
  Installed: 4:4.7.4-0ubuntu8
  Candidate: 4:4.7.4-0ubuntu8

$ lspci
00:00.0 Host bridge: Intel Corporation Mobile PM965/GM965/GL960 Memory 
Controller Hub (rev 03)
00:02.0 VGA compatible controller: Intel Corporation Mobile GM965/GL960 
Integrated Graphics Controller (primary) (rev 03)
00:02.1 Display controller: Intel Corporation Mobile GM965/GL960 Integrated 
Graphics Controller (secondary) (rev 03)
00:1a.0 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI 
Controller #4 (rev 03)
00:1a.1 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI 
Controller #5 (rev 03)
00:1a.7 USB Controller: Intel Corporation 82801H (ICH8 Family) USB2 EHCI 
Controller #2 (rev 03)
00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio 
Controller (rev 03)
00:1c.0 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 1 
(rev 03)
00:1c.1 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 2 
(rev 03)
00:1c.2 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 3 
(rev 03)
00:1d.0 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI 
Controller #1 (rev 03)
00:1d.1 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI 
Controller #2 (rev 03)
00:1d.2 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI 
Controller #3 (rev 03)
00:1d.7 USB Controller: Intel Corporation 82801H (ICH8 Family) USB2 EHCI 
Controller #1 (rev 03)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev f3)
00:1f.0 ISA bridge: Intel Corporation 82801HEM (ICH8M) LPC Interface Controller 
(rev 03)
00:1f.1 IDE interface: Intel Corporation 82801HBM/HEM (ICH8M/ICH8M-E) IDE 
Controller (rev 03)
00:1f.2 IDE interface: Intel Corporation 82801HBM/HEM (ICH8M/ICH8M-E) SATA IDE 
Controller (rev 03)
00:1f.3 SMBus: Intel Corporation 82801H (ICH8 Family) SMBus Controller (rev 03)
02:00.0 Ethernet controller: Broadcom Corporation NetLink BCM5787M Gigabit 
Ethernet PCI Express (rev 02)
04:00.0 Network controller: Broadcom Corporation BCM4312 802.11b/g LP-PHY (rev 
01)
0f:06.0 CardBus bridge: Texas Instruments PCIxx12 Cardbus Controller
0f:06.1 FireWire (IEEE 1394): Texas Instruments PCIxx12 OHCI Compliant IEEE 
1394 Host Controller
0f:06.2 Mass storage controller: Texas Instruments 5-in-1 Multimedia Card 
Reader (SD/MMC/MS/MS PRO/xD)
0f:06.3 SD Host controller: Texas Instruments PCIxx12 SDA Standard Compliant SD 
Host Controller

** Affects: unity (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/872977

Title:
  Minimizing a window breaks QComboBox in 11.10

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