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  • $\begingroup$ Yes, version 12 now handles underflow differently; see e.g. this. $\endgroup$ Commented Feb 3, 2020 at 15:38
  • $\begingroup$ Thanks, but how do I turn off the arbitrary precision in version 12? SetSystemOptions["CatchMachineUnderflow" -> False]; doesn't work, right? $\endgroup$ Commented Feb 3, 2020 at 15:43
  • $\begingroup$ @J.M.isinlimbo Rather, how should I set Underflow in version 12 to be same as my earlier version? any help is appreciated. Need this to work for a conference coming up soon :( $\endgroup$ Commented Feb 3, 2020 at 15:49
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    $\begingroup$ My experience with version 12 is very limited, so someone else will have to look into it. At worst, you may have to borrow a computer with 11.x. $\endgroup$ Commented Feb 3, 2020 at 15:52
  • $\begingroup$ Can you point out which part of the code produces the underflow? I tried running the code as is, and it produces an error, but then it just churns for a long time, and I didn't have time to let it run, or to isolate the source of the problem myself. If you do your own troubleshooting and isolate the problem further, then more help might be forthcoming. $\endgroup$ Commented Feb 3, 2020 at 17:46