yep, i also encountered bug in netsim 6.0. the bug is so soft so I don't think new cisco student would recognize it.

I have also got this product and used it due to Cisco's Packet Tracer being so limited with functionality. The product is full of BUGS which actually makes the learning process harder rather than easier. If Cisco ever get their act together and implement the full functionality of PAcket Tracer, their would be nothing out there to touch it.

I bought Boson Netsim 6 but I haven't found the Lessons Lab. Although the Lessons were in Boson 5 I don't know why ??

I bought the boson simulator,but i am not satisfied with the working of the simulator as i have come to the terms that the software has lot of bugs and it needs to be worked out as early as possible,still it is a good product for newbies who dont have live routers and switches in hand .