I suggest using another browser and seeing if that helps. I have a mac but I have found that when I use safari, I do not always get credit. When I attempt FC surveys, I use chrome or firefox. You can also try logging out of Fusion Cash and then logging back it. If the problem continues, try re-booting your computer. Maybe, it is just a bad day for the surveys.
If you are getting a blank page after clicking on a link, leave the page open longer. I am finding that it sometimes takes a long time to load a survey and I am staring at a blank screen for a very long time before it loads.