The issue:
Following an SQL server migration, and a Crystal Reports 7.0 to 2011 upgrade, our clients custom DLLs, were no longer being recognised and was not available in the formula workshop.
The client had copied the DLLs to the folder c:\windows\system32 folder, but this did not resolve the problem
The solution:
After looking as the system installation, it was found that the client had migrated from 32 bit machine to a 64 bit machine, and so the DLLs needed to be copied to the folder:
c:\windows\syswow64
Then using regsvr32.exe the custom DLLs had to be registered, to resolve the problem
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