kcachegrind opens file but does not display any profile information

Binary package hint: kdesdk

This is kcachegrind 4.3.2-0ubuntu1 on Ubuntu 9.10.
It was happening the same on 9.04 with kubuntu backports (at least, I can't remember if it happened with stock 9.04).

When I open a callgrind profile in kcachegrind, no profile information appears in any widgets : call stack is empty, callers list is empty. The only meaningful information is what appears on the status bar, at the bottom of the screen, where I see for example "profile.out [1] : Total cost (ticks) : 9 409". I guess it means the file has somehow been loaded.

What I expected was the call stack to get filled with a call list, and the other widgets to be filled as well.

ProblemType: Bug
Architecture: i386
Date: Fri Nov 6 11:16:58 2009
DistroRelease: Ubuntu 9.10
ExecutablePath: /usr/bin/kcachegrind
NonfreeKernelModules: nvidia
Package: kcachegrind 4:4.3.2-0ubuntu1
ProcEnviron:
 PATH=(custom, user)
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-14.48-generic
SourcePackage: kdesdk
Uname: Linux 2.6.31-14-generic i686