Client crash when moving PC token on a map with LOS on

[Bleak Midwinter]

Contents of console.log:

[3/31/2020 10:15:33 PM] Launcher scene starting.
[3/31/2020 10:15:47 PM] [<color="red">ERROR</color>] Database restore point found. Saved as new backup file (D:/Fantasy Grounds/campaigns/Across the Great Ocean/db.backup.637212897477159103.xml)
[3/31/2020 10:15:47 PM] Starting private server mode. [(xxxx) (xxxx)]
[3/31/2020 10:15:47 PM] Game server started. [xxxx]
[3/31/2020 10:15:47 PM] Launcher scene exiting.
[3/31/2020 10:15:47 PM] Tabletop scene starting.


Circumstance:
I have a map of size 751 KB. I have added Line of Sight markers to it. I can drag a player allied token through the various rooms, and some of them work fine, but when I drag it near a door to show LOS updates the client crashes (complete hang, doesn't update log or close gracefully - I have to CTRL+ALT+DEL shut it down).

The map is one from a Patreon sponsorship so I won't post all of it, I'll post an example of an offending door. It did work previously but it just seems to have stopped working ... I don't know why.

I'd really like to use LOS if possible so would be grateful to know what causes it and how to avoid it. I'll use masks in the meantime.

[Moon Wizard]

Can you recreate every time? If you can, please save off a copy of your campaign folder before making any changes.

A reproduce-able scenario allows us to fix things very quickly; whereas a general report we can't recreate on our machines takes much longer to solve.

Thanks,
JPG

[Bleak Midwinter]

I can recreate every time. How do you want me to send you the campaign folder?

[Moon Wizard]

Please send to [email protected], with the following information:

* reference to this thread (just copy link from browser)
* zip up the entire campaign folder, (if too large for email, please use Google Drive or DropBox to send)
* let us know the name of the image record where this happens,

Thanks!
JPG