ImageEngine/cortex — pull request #123 by goddardl (2013-09-30 22:40:46+00:00)
Title: Fixed a bug with the Nuke cache when using IECoreNuke::LensDistort

The bug was causing the cache to hold incorrect image data when the dynamic knobs were being updated. The solution was to prevent any "knob_changed" callbacks until all of the knobs had been created.