Speedbar 0.14beta4 bug

Hi,

I've just installed speedbar 0.14beta4 to replace the buggy emacs one. But I'm
experiencing this problem:

When I switch workspaces (in WindowMaker), the modeline contains:

(make-frame-visible (#<frame host@domain 0x8517f30>))

where host and domain are real ones.

This goes away, but it's here each time I've just switched workspaces and it's becoming
annoying.
Do you know where it comes from ?

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