[tshering]

Jellby, if you like we can try something. When KSM starts nickel it (or rather start_nickel.sh) checks whether an external sd is mounted, and if it is mounted, it communicates this fact to nickel. So maybe for some reasons the sd is not yet mounted at this point and therefore KSM does not inform nickel.
I upload a version of start_nickel.sh that waits some time for the sd to be mounted. You can replace the normal version in .adds\kbmenu\onstart with this version, or you can copy the new version to .adds\kbmenu\onstart\scripts and launch it by selecting "scripts" > "start nickel.sh".

Since exiting and restarting nickel did not help, I have some doubts whether there is really this timing problem.

Note: The usage of this script is only convenient for people who have always an external sd inserted in their reader. Otherwise it is a waste of time every time you start nickel.