Can you please test this new build?
https://render.otoy.com/customerdownloa ... _Win64.zip
Now the plugin should work without problems with multiple Octane ROP nodes, including the support of the ROP takes feature. The only issue is that the IPR icon in the shelf is going to open always the IPR of the first ROP node available in the scene ... if you want to open the IPR for the aditional ROPs, you must use the "Open IPR" button inside the ROP.
-Juanjo
Octane ROP and multiple Takes
Moderator: juanjgon
The current build 3.00.6.1 should work with Takes without problems. It is available for H13, H14 and H15 
viewtopic.php?f=102&t=52963
-Juanjo

viewtopic.php?f=102&t=52963
-Juanjo