Not at all. In fact, in the appearances they have made together since Kate started to return to work, I have thought they looked closer than ever. Certainly more physically demonstrative, one often putting a hand on the other’s back or arm and lots of looks over the shoulder to check in if they are not standing/walking together. They are both usually quite reserved and solemn at these things, lots of standing at attention while anthems are played and ceremonial whatevers are carried out. There are definitely places out there online that would delight in seeing their marriage fail, and cheerfully make up stories or find evidence to prove their theories, but William and Kate definitely are putting on a united front, in public at least.
On a side note, the inquest has started into the death of Lady Gabriella Kingston’s husband, who died by suicide during the height of the frenzy over Kate’s “disappearance” and became part of the more unsavoury speculation and rumours (including that he had been having an affair with Kate and William had killed him). They apparently now think that his suicide is linked to new medication he had started taking a few weeks before. Such a tragedy.