I was trying to bring over my settings from 9.5 and in order not to trash the original files (mainly RAMPresets.xml and ControlRoomPresets.pxml) I would rename the V10 files to xRAMPresets.xml and xControlRoomPresets,pxml - leaving them in the Preset folder - and then copy the 9.5 files over to the same folder (Presets).
I suspected that Cubase looks for any file with ControlRoomPreset in that folder and gets messed up and loses the Control Room connections-
So I removed all my “renamed/saved” files from that folder and then copied over the 9.5 versions.
And now Cubase functions as expected, recalling all the Audio Connections settings!
I found all my old presets contained in the XML file under the name RAMPresets.xml. In WIndows this is located in C:\Users\your_username\AppData\Roaming\Steinberg\your_cubase_version\Presets.
I upgraded from Version 11 to Version 12. I went to the location above in version 12 and made a copy of the RAMPresets.xml in Version 12 as it came with the system. Then I went to the same location in Version 11, copied the RAMPresets.xml from version 11 and pasted it to the same location in Version 12 over riding the one there (remember to copy the original before you do this). This copied the presets that I had done in version 11 to version 12.
I started Cubase Version 12, and all my presets where there. Hope this helps other. Tommy