If this is the same issue we are dealing with, I can tell you how to replicate it.
We are using Windows 10, FireFox and SmarterMail build 8797
We have seen a problem that if you have an email open and then change focus to another window, then come back to the email and click someplace edit it.... the composition box does not acknowledge where you newly clicked at (well, it does show the cursor there) but it instead starts editing the text at the last known cursor position before the window lost focus.
To Replicate this : Create a new email :
1) I create this :
This is a test of the lines
line 1
line 2
line 3
line 4
line 5
2) Place the cursor at the end of line 2
3) Change focus to any other open window
4) Change focus back to the composition box by placing the cursor at the end of Line 5 as if you were going to start typing.
5) you WILL see the cursor appear at the end of line 5 and flash
6) Press enter 2 times. When you start typing, instead of the composition box typing at the end of line 5 where you just placed the cursor, it will instead start typing at the end of line 2, where you had the cursor at before the window lost focus.
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