FMIS3: File.list() crashes core

Hi,
I can reproduce a crash of the core when using File.list() (with or without a filter function, it does not matter)

The problem appears after calling the function several times, not the first time.
The directory I list just contains some .flv files.
Calling list() in a loop makes the error appear earlier.
ulimit -c unlimited does not help. (I was suspecting lack of file handles or alike)

Has anybody else experienced a problem with File.list() ?

Crashing it several times seems to point to JS_SetElement() in all core dumps I produced.
OS: RHEL4 (32bit) or CentOS5 (64bit), it makes no difference.