Editing transactions now takes place without the use of the long loading pop up box. When you click on a transaction to edit it, the edit form will appear directly under the transaction. This should increase load times and make things smoother.
If you edit multiple transactions at once, the edit form will appear at the bottom of the transaction list (above the Edit button).
In fact, if you open the add transaction window and fill in some values (without submitting), then edit a transaction, the edited transaction will reflect the values you filled in the add section.