22.1.1; Frame title no more updated after calling `set-frame-configuration'

[Sébastien Rocca Serra]

Hi,
I have a problem with Emacs 22: I display the current buffer's name in the frame title, but as soon as I call `set-frame-configuration', my frame title no longer updates when I switch buffer.

Context
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1. I start "emacs -Q" with version "GNU Emacs 22.1.1 (i386-mingw-nt5.1.2600) of 2007-06-02 on RELEASE"

2. I display the current buffer's name in the frame title by running (setq frame-title-format "%b") in the scratch

3. I save the frame configuration by executing (setq my-frameconfig (current-frame-configuration)) in the scratch buffer

4. If I switch buffers, the title frame updates fine

5. I restore the frame config by calling (set-frame-configuration my-frameconfig)

Problem
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After calling `set-frame-configuration' (step 5), the title frame is frozen, it no longer updates when I switch buffer.

Notes
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This also happens in EmacsW32 "GNU Emacs 
22.0.990.1 (i386-mingw-nt5.1.2600) of 2007-05-23 on LENNART-69DE564 (patched)".

Thanks!