Foundry VTT Version: 0.8.9
Operating System: Windows 10 64bit
How Are You Using Foundry: (Hosted on Forge)
Which Game System: GURPS
Modules Enabled?: yes (including drag-ruler v1.8.2, FoundryVTT Arms Reach 2.0.11Libwrapper v188.8.131.52)
Drag Ruler doesn’t work properly when Arms Reach is also enabled.
So at first I thought it is a conflict between Arms Reach and Drag Ruler and opened and issue for
Drag Ruler: Multiple Errors and Tokens Getting Stuck with FVTT Arms Reach enabled · Issue #105 · manuelVo/foundryvtt-drag-ruler · GitHub
Arms Reach: Conflict with Drag Ruler · Issue #23 · p4535992/foundryvtt-arms-reach · GitHub
but neither found a problem/solution.
It also only happens when using Foundry via the Forge. Foundry on the desktop with both modules enabled works fine!
So by now I am convinced that it as a Forge issue. Which the following error message underpins:
Uncaught (in promise) SocketlibUnregisteredHandlerError: Function '_socketRecalculate' has not been registered as a socket handler.
[Detected 2 packages: socketlib, foundryvtt-arms-reach]
Also when I access a self-hosted game via Chrome it also woks fine. So it just happens when The Forge is involved.