First, I am really pleased you were able to determine the cause, I was completely out of options and had no idea why it failed.
After a quick look at Snapshot, I have no idea how it could interfere with Nyckelharpa and or HSM.
Having never used Snapshot, it may be best to ask the app's author how to proceed, and to identify how the interference is occurring.
Just wondering, what did you see in the log file that made you suspect Snapshot?
