We just pushed out a code change impacting versions 0.7.1, 0.7.2, and 1.0 related to how taxes are displayed for a completed order. If your store uses a lot of taxes, you should notice a significant performance improvement in your admin transaction history listing. The display itself is unchanged.
We do not foresee any issues with this change and did go through a thorough round of testing, but we're posting here just in case you do notice something incorrect related to taxes. Just reply here, and we'll take a closer look if need be.