Thanks for your reply.
No, sorry, not from the description above.
Aight, was just hoping to be lucky and that you had seen it before. :)
Could you send a small self-contained example (Lisp and C# code) which is sufficient to reproduce the error?
Yep, will try to do. I don't have the source for the assembly I'm using, but I'm trying to get it now, as well as information about how it was compiled. The following testcase works like a dream, but it's what I'll try to modify to fail if I'm able to get my hands on the code in question. <code> using System; namespace DT // short for DelegateTest { public delegate void DTDelegate(int count); class DTClass { public event DTDelegate DTEvent; public void Start() { for( int i = 0; i < 10; i++ ) DTEvent(i); } } } </code> <code> c:\WINDOWS\Microsoft.NET\Framework\v1.1.4322\csc.exe /target:library DT.cs </code> <code> (import-types "DT" "DTDelegate" "DTClass") (use-namespace "DT") (defun try-it () (let ((dt (new "DTClass"))) [+DTEvent dt (new "DTDelegate" #'handle-event)] [Start dt])) (defun handle-event (counter) (format t "~a~%" counter)) </code>