CRC has declared that drinking starbucks coffee has new issues with regards to kashrus (as seen below). You can listen to Rabbi Aryeh Lebowitz from YU discuss the issue in great detail here. Part of the kashrus issue seems to stem from the fact that many were under the impression that Starbucks was using soap when cleaning various utensils. Once it was discovered that soap was not being used, the trouble ensued. According to other blogs the OU seems to have a difference of opinion. Bottom line: ask your local Rabbi.