The latest plugin SDK shows that EX_CALL_BY_PROCID is now thread safe. But when I call a method in a preemptive process, I get error -10530. This error code does not appear in the SDK or the language reference error list. Any ideas? Same result with 18.2 and 18R3 Mac.
#define EX_CALL_BY_PROCID -118 // PA_ExecuteMethodByID (ThreadSafe)