UBS, the Swiss bank that became a symbol of ravages of the subprime crisis in Europe, failed to stem an outflow of client money even as it posted its first quarterly profit in more than a year on Tuesday. UBS shares dropped 5 percent in Zurich after the bank said customers withdrew 45.2 billion Swiss francs ($42 billion), from its wealth management units in the fourth quarter, almost double the 26.6 billion francs of redemptions in the previous three months. The bank said the asset outflows were mainly the result of client advisers leaving UBS and taking their customers with them.