Also make sure you have the TX indicator highlighted in the DAX channel as well as on the slice. I see this disappearing on program startup all the time!
Here is the setup:
Slice TX selected, DAX channel 1 selected.
Digital programs PTT working OK,
DAX Audio RX1 selected for audio in (which is working fine)
DAX Audio TX1 selected for audio out (no audio signal shows in the DAX control panel TX audio)
I'm open to further suggestions
A second issue with DAX maybe phantom copies.
When you deleted DAX you need to go into the registry and remove every possible reference to DAX and it's drivers, reboot the system and the reinstall it.
A third possibility maybe as simple as forgetting to check the DAX box on the transmit panel
Not sure if this will help, as my problem may have been different. Just 2 days ago my TX had quit working with my digital modes. After hours of doing the same as you I found CAT had dropped COM6. Funny thing I added another com port which showed up as com18 but magically com6 showed back up and everything worked fine. I can't explain it and maybe this isn't your problem but just thought I would share it.
Hope that helps.
Don - kx9q