flash error in firefox

[Simon Santoro]

If I access a page with flash in firefox, firefox closes itself with an 
error:

s2 at slappy:~ $ firefox
*** loading the extensions datasource
*** loading the extensions datasource
SessionSaver observer object: QI unknown interface: 
{9188bc85-f92e-11d2-81ef-0060083a0bcf}NP_Initialize
New
SetWindow
/usr/lib/mozilla-firefox/firefox-bin: relocation error: 
/usr/lib/mozilla/plugins/libflash-mozplugin.so: undefined symbol: 
XtWindowToWidget
s2 at slappy:~ $


it worked some time ago... does someone know how to fix this, or what 
broke it?
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