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.
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.
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\".