I'm having an odd issue here, and it's reproducable in a simple fashion:
If the source code has a table in it at any give spot, the last break tag immediately prior to the <table> tag is getting converted to a non-breaking space.
I'm seeing this in both CKE 4.2.2 and 4.3.1 currently.
Here's some example code I just knocked out. Note the after "three":
one<br>
two<br>
<br>
three<br>
<br>
<table border="1" cellpadding="1" cellspacing="1" style="width:500px">
<tbody>
<tr>
<td> </td>
<td> </td>
</tr>
<tr>
<td> </td>
<td> </td>
</tr>
<tr>
<td> </td>
<td> </td>
</tr>
</tbody>
</table>
<br>
four<br>
five
I can go into the source, edit it back to a break tag, flip back to preview and back to source, and it's a non-breaking space again.
This is giving one client fits as she's putting an image into a table, set align-left so that the subsequent text wraps, and that non-breaking space is worming its way before the first of the subsequent wrapped text, giving it a small indent.
As the demo for CKE is running ENTER_P instead of ENTER_BR, I can't test this there - is there anyone else out there running ENTER_BR enterMode who can give this a shot and see if they get the same result?

A bump for visibility. I'm
A bump for visibility. I'm sure other folks have this issue?