Hello, I just applied a small bugfix for this: it seems that the first time the toplevel is started, something is mixed up in the buffers and the first exported result end up in the toplevel buffer instead of the export buffer. I put back the `save-window-excursion' around the code that starts the toplevel to correct this.
Please let me know if it's again the custom to apply such tiny patch without discussing it first on the list. Best, Alan