problem with google chrome?

i run filefield in several sites but right now i realized an issue with google chrome (on mac).
actually what happens is that whenever i want to upload a file, the file-selection-window opens but ALL files are disabled and can't be selected.
the same site on other browsers (some machine) behaves correctly.
another site of mine running 6.x-3.2 does also behave correctly.
can someone confirm this?