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My TwinCat PLC project has been going well. Then one day it wouldn't run at all. It turned out almost all files in the project have symbols of a yellow triangle with an exclamation mark on it. What should I do?

Girl Spider
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I eventually solved the problem by launching the Windows register editor as an admin, then go to HKEY_LOCAL_MACHINE -> SYSTEM -> CurrentControlSet -> Control -> Lsa -> fipsalgorithmpolicy. Find the Enabled field and modify its value to 0. Relaunch Visual Studio.

This solved the problem. But the register gets re-enabled automatically all the time. So it seems before launching Visual Studio, I have to disable this register again every time.

Girl Spider
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  • That sounds like a very complicated solution :p. The other day there was an issue with visual studio if you tried to [dock/split floating windows](https://developercommunity2.visualstudio.com/t/Unexpected-VS-crash-when-docking-or-spli/1323017). This was caused by a windows update and it was fixed in a VS update. Maybe this issue is also caused by a windows update? And perhaps in the mean time a visual studio update has been released which fixes this? Or else you could try to revert the windows update. – Roald Mar 29 '21 at 12:12