A new version 8.4.2 has just been released.
For those who got a very early version of 8.4.0, on the contractor details screen the phone number fields were not visible. This was fixed in 8.4.1.
The new look ahead entry of the combo also caused a problem on some screens like the Add Income screen. After typing in Rent into the income group box, the tenant combo box should have been enabled to allow entry of the tenants name, but this was not happening. If you used the mouse you would not have had a problem. Version 8.4.2 fixes this.
You might also notice that the look ahead typing into the tenant combo box is a bit different to the others. This will be dealt to in a later 8.5 release. It still works pretty much the same, but looks a bit different.