Hello,
I have the same problem. There are a couple of webpages that don't be autofilled by the newest safari-plugin. It doesn't matter if I open the Engpass dialog by the shortcut or from the symbolbar. The 1st time I try to use autofill it just do nothing and just close the dialog.
Sorry, but Enpass is not really useful in this state.
Hope to get an update quite fast.
Thanks in advance.