Stranded cat5(e) is not recommended for use on punchdown keystone blocks. I am not saying that you can't make it work if you have to, but most cat5(e) keystone jack manufacturers do not design their keystone jacks for stranded cable.
For in the wall/ceiling runs of cat5(e) that will not be exposed to excessive flexing, solid cable is the norm. This is because solid cat5(e) is cheaper and has slightly better data transmission characteristics than stranded cable.
Stranded Cat5(e) cable is meant to be used in situations where the cable needs to be flexible. Patch cords are the best example of this. Solid cable would not stand up to the abuse that a patch cord can take, so patch cords are made out of stranded wire.
In contrast to the keystone jacks above, the actual RJ45 jacks that go on each end of a patch cable tend to work better with stranded cable. Again, this is not to say that you can't make it work with solid cable (I have done this myself when necessary.)
Anyways, hope this helps. Good luck!
