#316133
I'm currently working in Maxwell v2, however have had this same problem in v1.6 & v1.7 as well.

The Maxwell Render camera attributes in my scenes are vanishing. Any cameras I create before the problem happens move some (but not all) of the attributes to the "Extra Attributes" tab under the Camera Shape node; namely focus distance, shutter angle and ISO. Controls for EV, rotary shutter, etc. disappear. When I create a new camera, no options are provided whatsoever for Maxwell camera settings, so I can't set focus and the entire scene is crippled. When I open up earlier versions of the same scene, the same problem happens.

What is this? How can I fix it?
#325867
Maya doesn't provide an explicit mechanism for creating UI for user-defined attributes, so we've used a hack to implement it. In order for this to work, the plug-in must be loaded before opening the attribute editor for the first time. If you set the plug-in to autoload it works, but if you load it manually after you've used the attribute editor, the Maxwell rollup won't show up. We used to destroy the attribute editor window when the plug-in was loaded so that Maya is forced to rebuild it with our rollup the next time it's displayed, but that caused many problems (and doesn't work at all in 2011), so we don't do it anymore.
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