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VSE BoolProperties toggle when assigned False
Closed, ResolvedPublic

Description

System Information
Operating system and graphics card
Windows 10, ATI Mobility Radeon HD 4500 Series

Blender Version
Broken: 2.78c

Short description of error
Assigning False to ImageSequence.use_translation or .use_crop toggles between True and False

Exact steps for others to reproduce the error
Based on a (as simple as possible) attached .blend file with minimum amount of steps

  1. Create an Image strip in the VSE and type N
  2. Execute in console:

>>> X=C.selected_editable_sequences[0]
>>> X.use_proxy
False

>>> X.use_proxy=False
>>> X.use_proxy
True

>>> X.use_proxy=False
>>> X.use_proxy
False

>>> X.use_proxy=False
>>> X.use_proxy
True

The same problem occurs with .use_crop or .use_proxy
The problem does NOT occur with e.g. with RenderSettings.use_antialiasing

P.S. Blender crashes when I open die attached .blend file.