I've been animating in blender for a while and had this problem a long time ago. I never found a solution and now it happened again. I was messing with the NLA strips and now I can't push my action down or make any new strips. If I remove the action I can't create a new one on the armature. There's an image for reference.
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$\begingroup$ could you please share one of your file where it occures? blend-exchange.giantcowfilms.com $\endgroup$ – moonboots Sep 19 '20 at 6:01
