Nobody can tell you anything without proper system and version info. Also try and save your adjustments as a preset and recall them in the action.
Adobe Photoshop CC 2014.2.2
Mac Pro Late 2013 3,5 GHz 6-core, 64 GB ram, Dual AMD D700
OS X 10.10.2
I've tried the preset too - didn't work...
I am having the exact same problem. Other adjustment layers when changed record a "set current layer" but loading a preset or making a change on the curve is not being recorded at all. Tried deleting my prefs and that didn't solve anything. Would love an answer to this!
Close the Libraries panel and see if that makes a difference.
Also, check in Photoshop (Edit)>Preferences>Plugins and uncheck the Generator Plugin.
I had Generator Plugin already unchecked, but your suggestion of closing the Libraries Panel worked! Thank you so much R_Kelly!