i think the bright oval on the side is just the specular reflection of the table. looks to be in the right position, considering where the light is coming from. try taking away the spec on the table material and see if it persists.
good test, but i think the caustics are too intense, i don’t know this is the same that somebody have noticed yet.
the cube appears to need a little bit more of OSA or subdivision.
I hope i’ve help you.
And the strange shapes near to the caustics i think are caustics also. There’s a problem with caustic settings. Take a new look to the tuto on this topic.
yea the photon light might be turned up a bit to much for the light that is being projected on it to look equal. either turn up the spot light or turn down the photons to make it look more like the spotlights light is going through the glass and it will look more realistic!