Simulink Freezes when moving blocks

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EngM 2022-3-8

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https://ww2.mathworks.cn/matlabcentral/answers/1666829-simulink-freezes-when-moving-blocks

评论： Parker 2025-3-11

Hello,

Simulink for some reason freezes when I am trying to blocks around, it seems to happen when there are a lot of signals connection (something like 20+).

I do have a high end PC which should not factor in this issue.

Maybe it's something related to Java?

thanks.

MATLAB Version: 9.11.0.1873467 (R2021b) Update 3

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Roopa 2024-10-4

I have been facing the same problem, in 2022b. Twice in three days recently. Every time it is a different thing after which it hangs, like editing the constant value of a block or reshaping a block or area.

Is there a MATLAB shortcut to stop the hang without killing the whole session? Ctrl+C doesnot work.

Parker 2025-3-11

Have had the same issue in R2021b update 7 (9.11.2358333). Seems to happen when selecting multiple blocks and trying to move them. Simulink completely hangs, I can type stuff into the MATLAB terminal but any operation I try to run also hangs. I can navigate the toolbar ribbon and open different tabs, but the clicking the buttons doesn't do anything. The only option seems to be to kill MATLAB and restart. Very annoying. This issue has cost me many hours of rework since I can't save any unsaved changes once it hangs.

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