Since updating our ZCM environment to 10.2.1 from 10.1.3 all bundles containing a run script action fail.

The error logged is "Exception was: Could not load file or assembly 'ExecLibrary, Version=, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The system cannot find the file specified."

I have had to create batch files and put them on our network then specify a Launch Windows Exe action to replace the important scripts within zcm. We have heaps of bundles like this. Any suggestions? Fixes?