This is happening on Windows 10 Pro 64-bit with Affinity Designer 184.108.40.2061.
I have this one file that crashes Affinity Designer when switched to the Export Persona. I can manually export each Artboard fine in the Draw Persona.
It gets more complicated, though. I have this file link-embedded in several other files (Problem file > other files). Those other files can be switched to the Export Persona fine, but clicking on the Slices pane causes a crash. Exporting from the Draw Persona still works in those files.
But it gets weirder. I have one file in which I have link-embedded one of those other files with the problem file link-embedded (Problem file > other file > this one file). It does not cause crashes when switching to the Export Persona or using the Slices pane, and can successfully export all Slices as expected.
I have attached the problem file.
P.S. I know it isn't supposed to be possible to link embed files in Designer 1.7.2, but I needed it because I keep editing these files and link-embedding made replacing old versions much easier. When I needed to reload the link-embedded files, I would just open the file in Publisher and update it there.