This is due to the recent change to UDL to support one-way walls. Windows are on the roadmap for implementation <a href="https://app.roll20.net/forum/post/10798343/doorknocker-and-udlwindows-windows-stopped-blocking-movement/?pageforid=10799136#post-10799136" rel="nofollow">https://app.roll20.net/forum/post/10798343/doorknocker-and-udlwindows-windows-stopped-blocking-movement/?pageforid=10799136#post-10799136</a>
