UAD apollo multi-unit cascading...Only 1 visible in reaper!

[raqim]

Hi here
I just got a second UAD apollo unit, a 8 I link to my x8 via one of the thunderbolt adapter that UAD advices. In console, it's all good, the units are linked and responding to specs. I expanded the inputs and outputs in console's I/O matrix (it's not automatic) but reaper only have the 1st unit I/O available...
I have a year old version of reaper, maybe that's the problem? I'm gonna get a newer one, but if I'm missing something else, please tell me!