Hi David, I was going through the following thread: http://lists.onebuilding.org/pipermail/trnsys-users-onebuilding.org/2014-December/026862.html And I have exactly the same problem. Is it possible for you to share the Type155.dll for Matlab 2014a presently? I have requested subscription for the TRNSYS user list but it’s accepted yet. Thanks in advance, Sayani Seal