Hello Karl,
I have installed version 4.1.0.8 and 4.1.0.9 and here is working perfectly. However, I have found the reason of this bug: Since version 4.1.0.8 FLDIGI uses the decimal separator defined in the Windows Regional settings for the log frequency. You will see that since version 4.1.0.8 your Freq field contains a comma instead of a dot.
There are many Europeans countries (like Germany) using a comma instead of a dot and that causes this bug. I have uploaded a Beta correcting this:
www.swisslogforwindows.com/Beta/SwisslV5.exe
Simply download and REPLACE this file in the Swisslog folder. It should work now. Inform the other German user having the same problem.
Best 73