- There is a thread about that background problem, click
here 
- I cannot confirm any problems with the hadd and toolbar commands, I'm using them both on v 6.3 and they're working fine for me.
To check whether or not a hash table exists: if ($hget(name of table)) { ... }
To check whether or not a toolbar item exists: if ($toolbar(name of item)) { ... }
...Try to debug your script with these exemplary conditions. Or maybe you're using some kind of broken syntax?
