Running any ReaImGui script in 0.8.2 or higher, with these two DPI settings, fails with the following ReaImGui backend error message:

Unsupported HiDPI mode: select "Multimonitor aware v2" in Preferences > General > Adavanced UI/system settings.

On my Windows 11 system with two mixed resolution monitors (2160p/1440p), the only settings that scale both REAPERs interface, extensions like HeDa Track Inspector, and VST plugins, is to set the REAPER.exe DPI compatibility to "System (Enhanced)" and REAPERs own HDPI mode in Advanced UI settings to "Multimonitor aware (recommended)". Setting this to "V2 (experimental)" as the error message suggests does cure the ReaImGui issue but reintroduces scaling problems elsewhere in REAPER.

Rolling back to version 0.8.1 solves this issue, so it looks related to this change made in 0.8.2:

• Windows: temporarily disable usage under non-multimonitor aware HiDPI modes [p=2629558]

I'm not sure if this is blocking the "multi-monitor (recommended)" setting inadvertently or if there is a necessity for v2 to run newer ReaImGui.

Cheers!