Bob - I did try unregistering it and re-registering it. There is not another Chilkat dll. But now you have me wondering. The problem actually started Friday, but over a week ago I uninstalled DF 19.0 which probably had the DLL registered in that c:\dataflex\df19.0 directory. Can I unregister a DLL that is no longer there? But no other computers have had an issue with the uninstall of DF 19.0.

Also did the unregister/register while at a cmd prompt with admin rights.