7.0.0.4 was released late March and supports AutoCAD 2013.
I have no issues with Vanilla AutoCAD 2013.
Have you re-installed the MSI after installing 2013 ?
Is OpenDCL demand loading ie what happens when you enterOPENDCL at the command line.
If nothing, can you Appload the ARX ?
C:\Program Files (x86)\Common Files\OpenDCL\.....
If so, can you Appload a sample ?
C:\Program Files (x86)\OpenDCL Studio\ENU\Samples\_MasterDemo.lsp
From the Desktop, when you run the Editor :: From the Menu Select Help->About OpenDCL ... does the dialog display build no. 7.0.0.4 ??
Regards
Kerry