I am using version 1.2.7 of MM on Windows 10 64-bit. To recreate my problem have several transactions on display and select one near the top.of the list. Delete it (I used the Del key twice in succession). The deleted transaction vanishes and the row below is now highlighted. However, when you double click on the highlighted row it is not opened for editing.You must select another row and come back to this one before you can edit it with a double click.
I can't reproduce it in v.1.3.0