Thought I would tell folks how I fixed this issue. It involves the use of regedit so proceed with caution.
- Uninstall RDWorks and then delete the RDWorksV8 folder
- Go to the search line in bottom left corner of Windows desktop and type in “create a restore point”
- Create a restore point in case something goes wrong with regedit. This will enable you to recover if you mess up
- After creating the restore point, go to search line and type in “regedit”. Run regedit as administrator.
- Using the menu item Edit/Find, search for “RDWorks”.
- Delete all entries in the registry that contain “RDWorks”
- Exit regedit and reboot your PC
- Install new version of RDWorks.
This worked for me, I can now save and reopen files.