For unknown reasons, my image viewer application instantly deadlocks on cacao-0.97+classpath cvs when I specify a directory name on the command line. The deadlock seems to occur always when the directory in question is on a Windows FAT32 partition; it seems to occur randomly when the directory is on a Linux native (ext3) partition. Other JVMs (namely the JDKs but also jamvm+classpath) work fine on my system. The Swing user-interface starts up fine when no initial directory argument is specified, but selecting and searching a directory via the menu still seems to deadlock randomly. Demonstration (binaries, sources): http://tams-www.informatik.uni-hamburg.de/people/alumni/hendrich/niffler/ cacao -Xmx300m -jar niffler.Niffler /windows/c/temp/images deadlocks always cacao -Xmx300m -jar niffler.Niffler /tmp/tests/images deadlocks sometimes cacao -Xmx300m -jar niffler.Niffler seems to work Also, cacao seems to reliably deadlock when accessing a FAT-mounted file whose filename has non-ASCII characters.