My client has edrawings installed to review the models and drawings I make for him. However, he is not able to open drw files with edrawings. He is able to open part and assembly files. The drw file shows up in the preview pane, but as soon as he clicks on open, the system locks up and he has to shut it down. We have uninstalled, re-installed and recovered back to a time when it worked properly, but still no success.

Any suggestions?