if i export a mesh with Materials via Ripitide Pro, octane crashes all the time if i click on the obj in graph-editor.
no matter if the textures in jpg tiff or png-format. only mats with a simple color will be correct imported by octane.
here is a little c4d-Testproject ( zip-file) including the textures and an OBJ-File, created with Ripitide Pro .
Thank you in advance!

http://img.i7m.de/show/trtwt.zip