Premiere Pro 26.3.2.2 freezes (sometimes all windows) when the interface changes: main thread stuck in accessibility (UI Automation) requests
System: Lenovo Legion 5 15IRX10, Intel Core i7-14700HX, 24 GB RAM, NVIDIA GeForce RTX 5060 Laptop (8 GB), Studio Driver 617.42 (clean install), dGPU mode, Windows 11 Home build 26300.
Problem: Premiere Pro 26.3.2.2 freezes repeatedly when the interface changes: opening menus (File, Sequence, Markers), renaming items in the Project panel, typing in the Effects search box, and saving. Sometimes it recovers after some seconds (“in and out”); other times Windows shows “trying to recover your information” and closes it. During some freezes, other open applications also stop responding until Premiere Pro is closed. Once a “Drawbot UI Error: an invalid cast was attempted… OSImageInterface” appeared.
Evidence: three full memory dumps taken with Task Manager while frozen (26 Oct and twice on 28 Oct, during Effects search and during save) all show the same chain on the main thread:
user32!SendMessageW+0x1308→ Premiere Pro code recursing (same return addresses repeated) →uiautomationcore!UiaRaiseAutomationPropertyChangedEvent+0x894d6, witholeacc.dllon the stack in one dump.- At the same time, UI Automation worker threads are sending
SendMessageTimeoutW/GetWindowTextWrequests to the main thread. - All other threads (including NVIDIA driver threads) are idle.
Ruled out: freezes continue with Grammarly, Claude desktop, Legion Space and Copilot all closed; “GPU accelerated UI rendering” turned off; project stored outside OneDrive; GPU passed OCCT VRAM and 3D stress tests; no hardware errors in the Windows logs.
Question: is this a known issue with UI Automation handling in 26.2/26.3? I can provide the memory dumps if needed.
If you send me the link to your post once it’s up, I can help you reply to any questions from Adobe.
AdChoices