I ran the beta (in German UI - the installer seems to default to that automatically based on my OS language) and told L5 to (re-)build a personal book I has accessed before [noting a) my PBs where still there from the method 2 install and b) I could access the *.docx files even though they are in the user folder of my other user on this machine). L5 closed the panel where it was visible and started building the book. So far fine.
Then Windows told me "Logos had an error and needs to close". Whoop - gone. Of course I checked the logs: no crash log, no entry to the error log, no entry to the PBB log. The logos.log simply had stopped at 20:16.
The indexer was still working and is working as I write.
1145.Logoscrash.zip