I’m still having dificulties using smartRefreshBranch(). Deleting items is no problem (anymore, now I use smartRefreshBranch() instead of smartRefreshItem()), updating items isn’t, but with inserting new items Firefox keeps complaining about ‘npl is not defined’.
In my last message, you replied that there are no fixes for smartRefreshBranch() since ‘pro_v16_71114’ and I think I’m not the only one using the function 
So I must be doing somethin wrong, but I can’t figure out what.
The problem was caused by outdated version of dhtmlxtree and already fixed in latest dhtmlxtree 1.6 build 80512