The value on some boolean checkboxes can be unstable and return an error condition. This function can be used to set the value before reading it.

function FixBoolConnector(boolnode, conn)
{
try {
inv = Node.Value(boolnode, conn);
} catch(err) {
if(Node.ConExists(boolnode, conn))
Node.Value(boolnode,conn) = false;
}
}

If you open 2 link editor windows to the “/Preferences” the whole UI becomes unstable.

If you open a panel from a script button the undo history will be erased.

Oops, the panel button bug was already documented in May: http://clintons3d.com/wp/?p=283