There's something amiss either in construct or certain plugins.
I'm not sure if that's what's causing your problems, but I've had trouble running caps and exes regardless of which version of construct I am using.
For instance, the Advanced Camera plugin doesn't work on one of the supplied demos, but it does on the other, and both work for most people.
There's another example of it in a thread I posted in recently where a couple of people couldn't run the demo, but everyone else could!?!
It's not a shader issue on my machine either, because my card supports up to PS 4.0.