Created attachment 121632 [details]
Screenshot of Bullet and Numbering dialog
I sent a similar question to the LO mailing list, but since I didn't get any reply, I decided to file it as a bug, in case it really is one...
I installed LO 126.96.36.199 on a new Windows 10 laptop (immediately upgraded from 8.1 to 10 after purchase) the other day.
When I start LibreOffice, create an empty writer document, and look at "Formats|Bullet and Numbering...", I see the attached dialog. The effect in Impress is the same, btw.
When I load some of my ODT and ODP documents, I noticed that the bullets in lists are indeed missing or that unwanted characters are used.
Any idea what's going on? Should the LO installer contain some additional fonts that are not already present on a new Windows 10 laptop? Is it necessary to install additional fonts manually?
All the best
Unconfirmed with v188.8.131.52 under windows 10 x64.
Maybe you want to try a newer version.
And eventhough your machine is new, still try to reset the user profile (to be sure) and report back if the behaviour still isn't good.
Thanks for the suggestion, before tinkering with the user profile I download and installed 184.108.40.206 over the existing 220.127.116.11 and that already seems to have solved the problem!
*** This bug has been marked as a duplicate of bug 76239 ***