Testing the latest release and I found the following issuue with the VK color. If VK is "accidentally " pushed with default file name (but no associated file) in the path then a a warning "no such file" is received, but the VK remains blue, but not TX, even after the the action is cancelled. The only way I could clear the blue color was to add a legitimate path to file address. Neither right or left clicking removed the blue color even though there was no tx.
Could Tool tips be added to the "record" button in the audio section as is done with the buttons in the control panel to signify its use.
Finely the photo on the FreeDV.org page is rather dated given the changes made to the GUI recently, an updated photo would be appropriate.
As always congratulations on and appreciation of the work you have done to extend and enhance FreeDV for all amateurs.