Device: 5800
Firmware version: V 40.0.001 RnD
Release: qt-embedded-s60-opensource20091008-4.6.0-beta.exe
Platform: ARMV5 UREL
Compiler used: ARM/Thumb C/C++ Compiler, RVCT2.2 [Build 683]
Application: Mediaplayer demo
Launched from: Fluidlauncher
Problem description:

Opening a .png file when a video file is open in the main window partially freezes the application UI. Subsequent orientation switch crashes the app with KERN-EXEC 3.

Steps to reproduce:
Preparations: Shoot .mp4 video with camera if you don't have one handy. "designer.png" needed in step 7 is installed with either fluidlauncher or desktopservices, so if you installed standalone qmediaplayer, also install desktopservices demo.
1. Click on folder button
2. Select "Open File..."
3. Navigate to "Videos" folder and open a mp4 video file in qmediaplayer
4. Wait for video to play through.
5. Click on folder button
6. Select "Open File..." (Note that the popup menu disappears very fast when video is displayed, so you need to be quick)
7. Navigate to "Images" folder and open "designer.png"
--> qmediaplayer crashes with KERN-EXEC 3

Note that behavior has slightly changed since original report, as there is no longer UI freeze; it just crashes right away (HEAD at fc45c07c27100591750ad5c360fde535e15b9dbd - 3.11.2009)