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4.7 March 2018 CU FP32 - K2 Studio crashes when editing workflow which uses custom assembly

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This article was created in response to a support issue logged with K2. The content may include typographical errors and may be revised at any time without notice. This article is not considered official documentation for K2 software and is provided "as is" with no warranties.
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Issue

After applying 4.7 March 2018 CU FP32 K2 Studio crashes silently with an unhandled exception. It only happens when you edit a workflow which uses a custom assembly.

Symptoms

This is known issue which has been addressed in March 2018 CU FP35 see the following KB article for details - Hotfix: K2 Studio closes unexpectedly.

Resolution

Apply K2 4.7 March 2018 Cumulative Update Fix Pack 35 or newer or use the following workaround when you cannot apply a newer FP:

Copy the file SourceCode.Security.Web.dll from directory "[InstallDir]\Host Server\Bin\SourceCode.Security.Web.dll' into directory "[InstallDir]\K2Studio\".