Player Vision Preview goes black in some situations

Ran into an issue where player vision preview would show as all black on the GM side, even with a token selected. Changing the zoom on the map would fix it.

To recreate in a new 5E campaign:

1. Load Tomb of Annihilation
2. Open Map "Player Map - Cradle of the Death God"
3. Create a PC with Darkvision 60, put in CT, then put on map
4. Select the player token
5. Activate player vision preview (looks good)
6. Unlock the image record - map goes black
7. Lock the image record - map still black
8. Zoom in/out using mouse wheel, player vision preview restored

FGU v4.2.0
5E v2022-04-09

I just came on here to report the same thing. A couple points to add...

Freshly updated today. Disabled all extensions.

This was originally experienced by one of my players. We didn't try resizing, but was able to fix it most of the time by Enable/Disable Line-of-sight.

In testing this myself with another computer as a player, it seemed that there was a size sensitivity where the image was fine, until you made it larger/smaller (X or Y axis didn't matter) by say 10 pixels, then it was black until you made it larger again by 10 pixels and so on.

I was also able to recreate the issue on my DM side as well.

The tokens remained visible to both the DM and the players the whole time.

Zooming alone would not cause the issue, but would fix the black screen.

I'm running Pathfinder 1E.

Rob

During my last session I had also observed the map being completely revealed (on GM side) when Player Vision Preview was enabled (no LoS preview, etc). Also, a situation where with Player Vision Preview disabled, the GM view would not show line of sight for selected tokens. The steps below should show both issues.

I was able to recreate this in a new 5E campaign, no extensions:

1. Load module Tomb of Annihilation
2. Create a PC character with Darkvision 60 in Senses, put on combat tracker
3. Open the map "Player Map - Cradle of the Death God"
4. Drag token from CT to Area 77
5. Select token - it shows the GM view of the token LoS as expected (unseen areas are greyed out)
6. Turn on Player Vision Preview from top toolbar - it shows the Player view of the token LoS as expected (unseen areas are black, viewable areas are Grayscale due to Darkvision)
7. Unlock image - the map goes completely black (unexpected)
8. Disable Lighting - the Player Vision Preview now appears as expected (now showing color since Lighting is disabled)
9. Lock image - the map goes completely black (unexpected)
10. Close the image
11. Reopen the image
12. Entire image is visible (unexpected). Note that Player Vision Preview is enabled and no token is selected.
13. Select the token. The entire image remains visible (unexpected).
14. Zoom map in/out - Player Vision Preview now appears as expected
15. Un-select token (can no longer see anything)
16. Zoom map in/out - entire map becomes revealed
17. Disable Player Vision Preview using top toolbar
18. Close Map
19. Re-open Map
20. Select token - the entire map is revealed (in GM view) instead of showing non-visible areas slightly greyed out (no LoS displayed)
21. Zoom map in/out - line of sight updates and displays again as expected

FGU v4.2.0

My players had the same issue on Friday. All of us are updated to the latest version of FGU and playing a 5e campaign using the maps from Rime of the Frostmaiden module. I have a video of the behavior if it will help that I can email in. We found the quickest way to resolve the map going black for the players was for me to reshare the map.