|Yes, that is an issue which can apply when capturing from some offline players.|
You have to turn off video acceleration before capturing from those, like this:
Right click desktop > Properties > Settings tab > Advanced button > Troubleshoot tab. Move the slider right down to None. After you've checked out your capture put acceleration back to full again.
There's no need to do this with anything you see online.
The downside to Krut is that it is fiddly and will capture buffering pauses - so you sometimes have to choose a time when the net is quiet. The upside is that there is absolutely no video that you cannot capture and this is the only program I know that will do it for free. It took me ages to find it.
If you ever want to capture YouTube it is quicker and simpler to download "Youtube Downloader" (freebie). Often things on websites are also on YouTube.
Some systems force you to reboot when changing acceleration. I think there is a setting somewhere to stop that so if you run into it shout back and I'll check it out.
How to know you are getting old 3:
You start converting your age to hexadecimal