Dhoni is excellent Caption, No Doubt. His problems with Sehwag seems quite old. During the Australian tour, Sehwag was asked to sit on the benches in best of three finals when Sehwag was in such a good form and provided a comeback fight in 3rd test match and avoided the defeat in 4th Test by his 152 runs single handledly. Even Australian media quoted "There was only Sehwag standing firm between India and the defeat".
Before that Sehwag missed few matched in T-20 world cup too curtesy Dhoni with escuse of resting a few players.
During Asia Cup, last year, Sehwag was again rested without any reason and in a match Seresh raina was awarded "man of the Match for his 88 instead of brillinat 124 by Sehwag. Here i believe that Caption always have a say in the declaration of the Man of the Match award.
Dhoni's attitude towards Sehwag somewhat softened after the 87 run blast against England in the first test match.
These days Sehwag is in such a destructive and dominating form that even idea of resting him can invite strong criticizm otherwise i believe Dhoni would still like to rest him for few matches.
I don't know what and where is the problem, but it is there.
Let me clarify- I DON'T think and I never meant that Dhoni has anything against Sehwag. He may or may not have, but none of these things indicate that.
Dhoni was not the captain during the test series in Australia. He was the captain during the ODIs. Sehwag played 5 matches before the final and scored 81 runs with a highest score of 32. So we can't say that Dhoni was unfair and biased in not playing him. As a captain he took the call, and well we did win the Cup. If I was the one taking the call, I'd have played Sehwag over Uthappa as Sehwag on his day is the most destructive batsman. But we should appreciate that it was Dhoni's call as the captain. The other thing is that captains have no say in Man of the Match awards. It is decided by the match refree. From T-20 world cup, I just remember that Sehwag missed the final as he was injured. If India had already qualified for a round, there is no harm in giving other players on the bench a chance.
Even when I mentioned that he is not bowling Sehwag, I didn't want to say that Dhoni is biased. I am just saying that in my opinion Dhoni should bowl him much more than he does.