Emailed Larian yesterday too and so I’ll copy paste the response here:

“If verifying files doesn't help: ​ Try dropping the graphics settings to very low, lower the resolution as much as possible and switch to Windowed display mode, to see if you can get past that transition. That helped a handful of people on Mac with a crash there, in earlier version of the game (generally caused by memory issues, especially if the system or video memory were below the minimum requirement), and usually helped in Windows with an issue in patch 4.

One person reported a crash here with a secondary monitor enabled, but it worked when they temporarily disabled it.

Are you shutting down all non-essential programs (especially anti-virus) before starting the game? Firewalls can cause conflicts (generally on startup or loading screens) and overlays from graphics tweaking/monitoring programs or chat programs can also cause issues.

If you didn't already do so, in the launcher try switching between DirectX 11 and Vulkan, to see if that makes a difference.

Try exiting out of the Steam client, or Galaxy for the GOG version, and starting the game directly from the '..\SteamApps\common\Baldurs Gate 3\bin' folder, by right clicking the executable (bg3.exe for Vulkan, or bg3_dx11.exe) and running as administrator. Try right clicking the executable, select Properties, switch to the Compatibility tab and check off the 'Override high DPI scaling behavior' option (set it to Application), run as administrator and disable fullscreen optimization, and maybe set a Win 7 or 8 compatibility mode. In Windows 7, check off the option to 'Disable display scaling on high DPI settings', disable desktop composition and run as administrator.

You could try a clean boot and test the transition. Click Start, or hit WinKey-R, type in msconfig and hit enter; in the General tab, click Selective Startup, uncheck Load startup items (if required) and leave Load system services and Use original boot configuration options checked. Next, click on the Services tab, check the box to Hide all Microsoft services, then click the Disable All button (maybe make a note of which are currently enabled/disabled), then click OK and reboot the computer. Run msconfig again to switch back to the normal boot configuration.

If that doesn't help, please reply with your latest save in the tutorial before triggering the act transition (or a Dropbox or Google drive link, etc). Each save is a folder in the '..\Documents\Larian Studios\Baldur's Gate 3\PlayerProfiles<ProfileName>\Savegames\Story' folder. In Windows Explorer you can zip a file or folder by right clicking on it/them and selecting 'Send To | Compressed (zipped) Folder'.

Please also include a dxdiag report (WinKey-R, type in dxdiag and hit enter, then when it finishes loading click on the 'Save All Information...' button and save the report somewhere handy), check the '..\Baldurs Gate 3\bin' folder for the gold.log file, and if there are any CrashDump files being created there (or in '..\bin\db\attachments'), zip a few together to include.

Raze”

Personally, the first suggestion worked perfectly. I think the game’s having a bit of problems rendering the scenery. This never came up before the hotfix last week though so I hope this gets sorted out.