Biasing AC signal with DC - not working please help

For one thing the capacitor blocks the DC. Capacitors are used like that in amplifiers to remove any DC signal which might be present in the output. The other thing is, simulated voltage sources can be unrealistically powerful. In this case, the 10V AC source pushes current into the 5V DC source, and it would do so even if the 1 megaohm resistor between them was just 1 microohm. On the first day I used EveryCircuit, I found a 1V pulsed source could supply 70kA!

All what eekee said + consider, http://everycircuit.com/circuit/5328550033096704

The node you should be seeing (blue graph) is the one where the two resistors meet, not the one after the cap, capacitors are essentially open to DC and if large enough shorts for AC, so no matter your bias before the cap, the node you set to see will always be at 0V in the center. Next, the voltages are a bit off, the bias voltage should be equal or greater than the maximum peak negative voltage of the AC signal, so try making the bias DC 10V and the AC peak less than 10V. And finally, the main problem with your circuit is that all the current is being drained through the AC signal so no voltage drop is developed across the second resistor, this is because current follows the path of least resistance and the AC signal branch has no resistance compared to the 1M ohm branch, so lower the values of the resistors to 500ohm and put a 1kohm in series with the AC signal. Check out the graphs in my class A amp circuit to better understand how bias works ;)