Upgrade to the latest Hamlib -- and if you still have problems do the debug stuff too.
New hamlib for installation directions
#1 Shut down WSJTX/JTDX
#2 Download either the 32-bit or 64-bit DLL matching the 32/64-bit version of WSJTX/JTDX -- hopefully your browser doesn't block it but may warn you multiple times.
If you can do a "Save As" you can save it directly in \WSJT\WSJTX\bin and replace the libhamlib-4.dll that is there.
http://n0nb.users.sourceforge.net/dll32/libhamlib-4.dll
http://n0nb.users.sourceforge.net/dll64/libhamlib-4.dll
Linux/Unix/Mac users need to compile the latest tar file from http://n0nb.users.sourceforge.net/\Note: If compiling on Unix-like systems please uninstall any Hamlib package you have before installing the new build
#3 If you don't save directly you need to open a file browser and move the file that way.
If you're not familiar with that here's a video on the file browser - https://www.youtube.com/watch?v=AyVqCJrs9dk

For Debug:
Please place this file as described belowhttps://www.dropbox.com/s/t52ngcalsgnpm8m/wsjtx_log_config.ini?dl=0
C:\Users\[username]\AppData\Local\WSJT-X The WSJT-X_Rigcontrol.log file will be in the same location For Linux put it in   ~/.config The WSJT-X_Rigcontrol.log file will be here: ~/.local/share/WSJT-X Restart WSJT-X and duplicate the problem.Shut down WSJT-X
Then send me the WSJT-X_RigControl.log fileMike W9MDB