The graphcrs.cpp line 2361 error seemed to be caused by user cursor motion/programattic active cursor assignment when moving through cases in an elaborate state machine. Upon unlocking cursor as free or 0 into each case that assignments are made, indexing it to -1, doing my business and then locking cursors appropriately before leaving a state or substate, the problem seems to be alleviated. By using separate waveform graph property nodes 1.)to unlock and index, 2.)assign values to x and y position if needed or read x and y positions, then 3.)locking the cursor to plot in another property node, before going to 4...)the next active cursor in its own property node sets, satisfactory performance was achieved. Ordering operations within a single property node was not sufficient.
