Openshot causes 100% CPU in Pulseaudio, video too fast

[Samson]

Using Openshot 2.0.6 Pulseaudio immediately begins using 100% CPU when I play a video.

When playing a video clip the sound is garbled/corrupted, and the video plays too fast. Changing channels/sample rate in preferences appears to make no difference. When I pause the video, Pulseaudio continues to use 100% CPU.

Ubuntu 14.04.3 LTS
Linux 3.13.0-68-generic #111-Ubuntu SMP Fri Nov 6 18:17:06 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

openshot-qt 2.0.6+0+587+97+201602142101~ubuntu14.04.1
pulseaudio 1:4.0-0ubuntu11.1
libmlt6 0.9.0-3
libavcodec 6:9.18-0ubuntu0.14.04.1

The problem is not present in Openshot 1.4.3 on the same system, using the same video clips.