Hi,
Please test mmdevapi again using testbot job #15369 with exclusive mode disabled.
Brian, it seems like you had some other app use audio while performing the tests. This would explain the DEVICE_IN_USE error: render.c:427: Test failed: Initialize(exclus., 8000x 8x1) returns 8889000a and the subsequent crash. My new version of the tests should prevent crashes in such a situation.
Saulius, you need not perform many tests because of random GetPosition/Padding failures. I've not yet changed that part of the tests.
Thank you for repeated testing, Jörg Höhle