Space AAX DSP giving AAE -9060 error

[monasterio]

Hello

I have a pro Tools HDx3 system, with Pro Tools HD 11.3.1 Software, running in a Mac Pro 5,1 12 cores 2.93GHz, 32GB Ram.

I'm running some pretty big session with around 3 hundred tracks and countless plugins, but since few months ago I cannot open new Space AAX DSP instances in this sessions nor convert from Native to DSP. I still have 3 free slots in HDx card 2 and the whole HDx card 3 available. The message I get is:

The Plug-in could not be made active because a AAE error was encountered.
AAE error -9060 was encountered.

Note that I have many Space AAX DSP already running in this session with no problem, but I can't open new ones. Other DSP plugins are working without problems.

I have already try to clean PT preferences, but the problem persists. Also when I try to remove one instance of Space DSP to open another one in other track, in general I get the same error, so in general I need to move from one track to another to be able to use DSP

Can anyone help me with this issue?

Thank you
Raoni