Fixed houdini crash when doing several interactions with iDisplay open.
There have been some issues reported which was causing houdini to crash after rendering on 3Delight and then doing any of these interactions while iDisplay is open.
- Deleting ROP after rendering on iDisplay and having it open.
- Creating another file from houdini after rendering to 3Delight. This would fix several issues. Fixes #32 (closed), Fixes #227 (closed), Fixes #300 (closed).