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Hi,
Hard to tell but do you have both scope inputs grounded? That would cause high current in the output.
It does look like you need the diode as suggested because that cap has to be allowed to charge when the bridge goes low, then act in series with the bridge output when the bridge output goes high and thus provide a voltage that is about 2 times the supply voltage when the top transistor is to turn on. That's very important too unless you only intend to output peak voltages that are lower than the supply voltage by some 5 to 10 volts, which is not the way it is usually done because one of the design goals in amplifiers like this is to utilize the supply voltage as much as possible with a given topology.
