closing autolog prevents re-opening

I have a world, with the logging filename in the logging preferences set to %L\%N.txt.
If I use control shift j to close that log file when the world is opened, I'm not able to re-open it
with control shift j - I get no prompt to enter a filename, and pressing OK has no effect -
I get no prompt to close the log file when I press control shift j again, so I assume it's not open.
This also applies to opening the logfile manually before the world connects and it automaticly opens.

The log file directory already has a trailing backslash on it. Thus it is trying to open a file with some_dir\\some_file.txt in it, which the Windows file picker then decides to silently ignore. The program thinks you cancelled the dialog, whereas it actually never appears.

To fix this, change the log file name to: