I just recently noticed that a custom data reference of mine is working in 32 bit PI System Explorer but not 64 bit. In the 64 bit version of PSE, I get an error because the context object (parameter for the getValue method) is null. I use the context to substitute configuration strings using the static AFDataReference method SubstituteParameters. I am compiling against Any CPU. Any ideas as to the difference in performance? Thanks for any and all comments/advice!