Sim Frozen after trying to set one ball on top of the other using keypad entry

[kathy-phet]

Had 4 balls out, and was arranging using keypad. The sim froze when the entered value would have made a lot of overlap, and I cannot close the dialog box or anything.

Actually had to close the browser tab. Refreshing the browser tab did not work. Then in new tab it also failed to load with error (Failed to load resource: net::ERR_CONNECTION_RESET).

[arouinfar]

For phetsims/qa#524

[brandonLi8]

I tried in both Explore 1D and Explore 2D was unable to reproduce. @kathy-phet what screen were you on and do you happen to remember the rough configuration/values you tried to set to?

[kathy-phet]

Hi Brandon - To reproduce, do this, earlier this morning I did this:

go to the 2D screen
click the ball number up to 4 balls
click the more data option
manually try to change each ball in order to be at y=0
my sim freezes when I do this for the 4th ball

Except - now it doesn't crash - I don't know what changed! Maybe the new rounding algorithm fixed this issue, or maybe it was a corner case with my computer somehow.

Ignore for now - I'll report here again if I see it crop up again.