Keyboard player Tom Simpson has headlined with his band Snow Patrol at T in the Park, despite being detained in Middlesex by police on Saturday.
He was arrested in connection with a failed court appearance in Glasgow.
Strathclyde Police said a 35-year-old man had been due to be transferred to their custody from Uxbridge Police Station, but was later released.
The band, who met while at university in Dundee, were the headline act for the festival in Balado, Kinross-shire.
Earlier, Amy Winehouse pulled out of her slot from the event suffering from "exhaustion".
Organiser Geoff Ellis said: "We just hope she can take a bit of rest and get back to her best."
Meanwhile, the car parks at the site were fully reopened after heavy rain left the area thick in mud.
Parking at the event had been limited on the second day of the festival and fans had been urged to travel to the site on public transport.
Good weather had since helped to dry the fields out, and police said there were no traffic problems in the area.
Mr Ellis said the site had been bearing up well and the mud had not dampened spirits.
"We've got glorious sunshine today and we had fantastic sunshine yesterday," he said.
"Obviously there were problems with the car parks on Friday due to the weather, but most people had got in by then."
Tayside Police said they had arrested 46 people in the first two days of the festival.
Ch Supt Matt Hamilton, the officer in charge of policing the event, said: "Encouragingly arrest figures on site at T in the Park are much lower than a town centre on a Saturday night.
"The numbers are incredibly low considering the amount of people on site and we're happy with the way things are going."
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