I have had this problem several times before but only today I understood why it was happening.
Yesterday I recorded a normal project and did an audio mixdown using Ozone 9 on my stereo out for dynamics etc.
Today when I opened the project again, I had a huge midi delay coming from all my different keyboards.
There is no audio latency problem as there are only a few tracks in the project.
I read in an old post that someone was using a multiband compressor on the stereo out and by removing the effect, the midi delay problem went away.
So I removed my Ozone 9 and like magic there was no midi delay anymore.
Why is this happening Steinberg?
There must be a way to fix this.