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I got a response from maxon Support: This is a known issue with Moves that requires an update to fix. Unfortunately the only workaround for this issue right now is to use Cinema 4D R23 until our developers are able to fix it in a future update. You can keep an eye on our Release Notes page, below, to see if a future update contains this fix: https://support.maxon.net/hc/en-us/categories/4405723856402 I gave it a try in R23 Re-importing the capture in r23 seems to work, and opening that project again in R26 seems to resolve that issue. The blend shapes are animating and accessible.

This is a script I just created to demonstrate the basic steps to perform. It (hopefully) might trigger some to dabble in script-writing ... The script was written for R20, but should run in more recent versions. ... if not, or if you need the script to perform additional things: check out https://developers.maxon.net/docs/Cinema4DPythonSDK/html/index.html and modify the script to your liking. import c4d # This script will split off the selected polygons from an object into a new object # (c) 2022 Daniel Sterckx - 26-aug-2022 def state(): return c4d.CMD_ENABLED def removeSelectedPolygons(obj, polyS): # remove the selected polygons c4d.utils.SendModelingCommand(command=c4d.MCOMMAND_DELETE, list=[obj], mode=c4d.MODELINGCOMMANDMODE_POLYGONSELECTION, doc=doc) # Prior to R20 removing polygons would leave the points intact, # resulting in orphan points, which need an additional step to be removed/cleaned-up # The following lines of code can be removed for R20 and above if c4d.GetC4DVersion() < 20000: # remove unused points as a result of polygon removal bc = c4d.BaseContainer() bc.SetData(c4d.MDATA_OPTIMIZE_UNUSEDPOINTS,True) c4d.utils.SendModelingCommand(c4d.MCOMMAND_OPTIMIZE, list = [obj], mode = c4d.MODIFY_ALL, bc=bc, doc = doc) return def main(): # Get the (single) selected object obj = doc.GetActiveObject() if not obj: print("No object selected") return if not obj.IsInstanceOf(c4d.Opolygon): print("Not a polygon object") return # Get the polygon selection objPolyS = obj.GetPolygonS() if objPolyS.GetCount() == 0: print("No polygon(s) selected") return # Preapre the document for undo doc.StartUndo() # We duplicate the selected object, revert the polygon selection, and delete these selected polygons # Since we cloned the "split-off" object from the original object it will have the "active flag" set, # we thus remove the BIT_ACTIVE from the duplicated object to prevent it from being selected cloneObj = obj.GetClone() cloneObj = obj.GetClone() cloneObj.DelBit(c4d.BIT_ACTIVE) doc.InsertObject(cloneObj, parent=None, pred=obj) doc.AddUndo(c4d.UNDOTYPE_NEW, cloneObj) clonePolyS = cloneObj.GetPolygonS() clonePolyS.ToggleAll(0, cloneObj.GetPolygonCount()) removeSelectedPolygons(cloneObj, clonePolyS) # We delete the original selected polygons on the original object doc.AddUndo(c4d.UNDOTYPE_CHANGE, obj) removeSelectedPolygons(obj, objPolyS) # Finalize the undo, and trigger Cinema4D that something was changes doc.EndUndo() c4d.EventAdd() return if __name__=='__main__': main()