Seems like I've found a bug with proxy in octane for 3ds max 2016. Verion 2.25-2.21 (Windows 10, gtx 780)
Steps to reproduce.
1)create some object
2)Assign octane material to it, with diffuse rgb texture.
3)Right click in viewport>export to octane proxy. Do NOT use "replace original" checkbox.
4)Create new empty octane proxy object, and assign previewsly exported file to it.
If I use checkbox "replace original" then all renders fine, but I can't create empty node, assign proxy file and render with materials.
Please take a look at attached file.
Sorry for my bad English
Win 8 PRO x64/ Core i7 950 / 16gb RAM / GTX 460/ GTX670/