Hi Azzy:
I have already said this, but here we go.
OK so using my HDR, I saw my mom die in an accident on a wet rainy road, so I told her not to go out that day because it was raining. Also, there was fog, and the brakes on her red car were bad, so she decided not go. A few days later, my mom was driving my green car. It did not have any bad brakes, but she hit a man driving the wrong way. He smashed into us. Sadly, my car was completely totaled and both of us were taken to the hospital in an ambulance. Still remember them checking my mom's heart with a machine. Oh, by the way, we are fine now. Yeah, the law of karma kicks in.
There was another time when I used my HDR and saw in the future my house burn down, I do not live there any more. OK so I bought this smoke alarm, that woke me up around 3 AM in morning. The toaster caught on fire, but I put it out using the fire extinguisher and guess what... just some days later, I lose my job, so the law of karma does kick in.
I was told this by a russian HDR user. OK, any time you use the HDR to change things, something bad can occur. For example, if you go back and save your mom. Well, you will lose something that is very valuable to you. Like you will lose your job or your house will burn up. Still, it is a price I am willing to pay.