This looks (no pun intended) to be related to the changes in DayZPlayerCameraBase::UpdateUDAngleUnlocked in 1.30. Reverting these to the 1.29 code fixes the issue.

I've made a video that shows the issue more clearly. I really hope it doesn't stay like this. I can hardly imagine this is an intended or planned change, at least not for PC.

https://youtu.be/R-gNgq2ovO0

You are my hero for posting a video of it. I have been scouring the internet since 1.30 exp release and I was starting to think I was insane.

I am really glad you have identified exactly what it was that broke it. I have some modding experience but the camera bug was a little beyond my ability to find what changed that broke it.

It seems the current 1.30 UpdateUDAngleUnlocked can be fixed by just replacing this block inside of it

				pAngleAdd 	= pAngle + pAngleAdd - target;
				pAngle 		= target;

with

				if (Math.AbsFloat(pAngleAdd) > 0.001)
				{
					pAngleAdd 	= pAngle + pAngleAdd - target;
					pAngle 		= target;
				}

(i.e. restoring the surrounding condition that was used in 1.29 and is also consistent with UpdateLRAngleUnlocked)

Forgive me for my lack of knowlege but where does one find this line of code?

It's in scripts/4_world/entities/manbase/dayzplayer/dayzplayercamera_base.c, around line 172

If you want to fix it on your own test server for now, you'll have to replace the entire UpdateUDAngleUnlocked() method.

You are excellent. I really hope Bohemia fixes this before release. If not, it seems like it should be patchable. Looks like I have a project this weekend.

I am finding that out now. Ya'll have really saved the day. Words cannot describe how much I was beginning to question my sanity and how much I watched people's videos of 1.30 for anyone having this same issue.