First, this is another great feature! 
Mostly there is no problem in the usage of the new folder icon labels, except
they seem not to work in a filtered environment (filter folders only / newer than 168 hours) OR because i already replaced
all standard icons, like described in this thread:
[url]Change the default folder icon in Opus]
I can set the new icon folder label, which stays visible when i click "apply", but when i click "OK", it disappears.