Same here. I formatted my machine in a desperate attempt to fix this issue but still the same. I am getting max spikes when i use midi keyboard to send a program change. I dont think i get the same spike when i change internally, will need to check this. I think its a driver issue as I was using the UR22 without issue and now I upgraded to UR44 have this problem. I thought it was to do with third party pluggins but nope, exactly the same after clean install and only Halion Sonic.
Dont suppose all the others having this problem have changed or updated any USB or MIDI drivers prior to this?
Has anyone logged this as an issue as I find it strange Steinberg have not acknowledged an issue as a result of all these post?
I have an MSI Nvidia GTX 670 graphics card which has never caused problems prior to C8. Does anyone else have same card on C8 without issues?