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This is for v11.2. Sometimes when I open up and then evaluate a notebook, the following messages appear:

Drop::drop: Cannot drop positions 1 through 1 in Manipulate`Dump`duration.
Drop::drop: Cannot drop positions 1 through 1 in Removed[$$Failure].
Drop::drop: Cannot drop positions 1 through 1 in Removed[$$Failure].
General::stop: Further output of Drop::drop will be suppressed during this calculation.

Mathematica then just hangs. Every time this happens I have to restart Mathematica or restart the kernel several times. Also, I don't understand how I can be getting errors associated with Drop and Manipulate when I those functions aren't used in the notebooks I'm opening. Uninstalling and reinstalling hasn't fixed this.

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    $\begingroup$ Have you changed the default style file? $\endgroup$ – bill s Oct 20 '17 at 0:10
  • $\begingroup$ Possibly... but I thought I reset it. Just to make sure, how would I go about resetting it to default? $\endgroup$ – S. Povolny Oct 20 '17 at 19:12
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I am seeing the same error messages now that I have installed v11.2

When the error occurs, check in Task Manager if there are multiple instances of the Kernel running. Kill all of them from task manager. Then start a new kernel from the Evaluation menu. Then evaluate your notebook. This usually works.

I have no idea why I occasionally get two or more instances of the kernel. Maybe it has something to do with loading .Net support

Needs["NETLink`"]
ReinstallNET["Force32Bit" -> True];

I am finding v11.2 prone to becoming unresponsive very easily.

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  • $\begingroup$ A contributing factor may also be multiple definitions in different contexts for the same named item. e.g. definition in a Package and in Global space. $\endgroup$ – Richard Scott Oct 28 '17 at 5:05
  • $\begingroup$ I reinstalled 11.2 and it was working alright until today. Concerning multiple kernels: usually there's one kernel doing nothing and the other using up CPU. I have no issues killing the former, but the latter is very hard to get rid of. I think I'll just downgrade to v11.0 or earlier for now... $\endgroup$ – S. Povolny Nov 6 '17 at 23:42

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