Thanks for the heads up. Since acutRelRb() on the returned list is a no-op in AutoCAD, an easy solution would be to call acutRelRb on both platforms (except that for OpenDCL that would mean adding acutRelRb in 446 places). I just did a quick test, and the more serious problem is that in Bricscad every call to acedGetArgs returns a new copy of the argument resbuf. This causes the OpenDCL argument processing algorithm to fail because it calls acedGetArgs a second time to get back to the head of the list for calculating which argument triggered the argument processing exception. All this because Autodesk forgot to type the returned resbuf* as const in the R13 header file.
Hopefully Bricsys fixes their implementation to match AutoCAD's, then I won't need to worry about it.