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Mount a filesystem, and then choose a subfolder, and select this menu item to create a new treefs rooted on that folder. The menu is frozen onscreen until the filesystem is mounted. Probably this could be done in another thread, so that the menu can be hidden - it would be more responsive.
All actions are run in the request processor currently, not AWT. Do you have a thread dump to back this up?
This is possible. There is a asynchronous request processor task and AWT probably waits for it to finish. I have to modify it.
Version 1.24 does not seem to block. Please give stacktrace if you see it again.