For a while now it's been impossible to clear out a large number of downloads without Limewire completely locking up. It's still the case with 4.9.4: the items disappear when you hit cancel or clear inactive, but the interface then stops responding. Task manager shows that Limewire has hung with 100% cpu use. If a stderr console is open it floods with lines like these:

The time given is wrong by exactly an hour -- the system clock when this one appeared was 10:27:34 PM.

Looks like clearing out downloads makes Limewire unload a semiautomatic directly into its own foot, resulting in the observed crash.