Arnold cryptomatte sequence is giving me different colors

[alkaf_salem]

Hi
Im still new to Arnold and im trying to use cryptomatte in the composition

so far it was working fine but now I have an issue which the solid colors it gave are different each frame, its not stable to the same color

also as you guys can see in the attachment my arnold volume object cannot be read in cryptomatte , is there a way to make it readable ?

[CiroCardoso3v]

Can you provide the scene for testing?

[Stephen.Blair]

What version of MAXtoA? You need to use at least 5.6.10

Help | 5.6.1.0 | Autodesk

• MAXTOA-1538 - Fixed a bug where node names in the Arnold scene changed from frame to frame. This caused incorrect results when using Cryptomatte.

[RenderQ]

It was bothering me as well, update or check this option.