Your comments

Hi Inna, thanks for your help!  Unfortunately, I don't think this made much of a difference.  Now I've noticed the other book,which was always very fast before, has started lagging sometimes now too. Is there any way to cache them to the device to help it out?  I've tried different web browsers, but it seems about the same in each.  Thanks.
Hi Alin, did you get my sample? Is it also inconsistently working for you?
Thanks Alin, it should be in your inbox.
Alin, I agree your example is working.  Inna, I am using "center."  And yes, the user is able to continue moving the element around the screen.  The problem comes up after the lizard has been moved around a bit.  The first move sets the counter correctly.
It's pretty reliably unreliable--working about 85% of the time. The counter is displayed in the top right corner. The intersections are to set the counter to 1 if the lizard is on the green grass and 2 if on the brown grass. The counter resets outside of the grassy area.  Also, there are intersections to turn on the black box highlight when the lizard is on the grass and the counter is set to the right value (1 for green, 2 for brown)--this is my check to make sure the counter is updating once I turn off the display.

Here it's working correctly:

And now you can see it has stopped working correctly:

Do you have any suggestions for making this better?  I don't want the kids to be told they're wrong when indeed they are correct!
Alin, update, actually I removed all of my intersections and added them again and it seems to be mostly working.  Randomly, sometimes it doesn't seem to trigger the counter, but for the most part it's now working.
Hi Alin. Thanks for the example.  When I use "counteradd" it works just like in your example. I don't want to add, however, just set it to the value.  When I use "counterset" instead of "counteradd" with everything else the same it does not appear to update.
Yes, but I need to be able to make edits and actually run them with research participants, not just preview them.  I am looking forward to your update and hope it comes very soon.
So you're saying that right now my book does not work in IB4, there's nothing I can do about that, and I cannot use IB3 to make updates?  I am using these books for an ongoing research study and I need to be able to make edits.