Weird, I can't figure why in full scene reload mode some frames are rendered black. If you can send me the scene I could take a look at it here, but we can have also a clue about this problem in the log that you get while rendering the sequence if you enable the log options in the plugin options panel.
You can send me the scene and log by pm if you want.
Computer Graphics Software Developer
Octane plugin development and support: LightWave and Houdini