Ok, it happened again, the next time I did the same marriage auto-text.
Here is an image of the problem. The top one is what ended up in FH. The bottom is what was in AS auto-text window (looking fine), which I copy and pasted to FH (I copied before saving in AS just in case the problem occurred again. It looks like something has gone wrong with the column sizing as if it is 'fitting' the text in the cell and ignoring the column.

- Auto-text Problem.jpg (91.17 KiB) Viewed 910 times
Looking at the raw Rich Text in FH, it looks like the the <table> definitions have gone walkabout.
<table="6000">
<row> <align="c"><font="Old English Text MT","script",0><fs="+4"><clr="00007F">Parish Register of a Marriage</font></fs> </clr> </row>
<row> <align="c"><clr="00007F">MARRIAGE Solemnised in the Parish of </clr>Rainham<clr="00007F"> in the Year </clr>1817 </row>
</table>
<table="4390|405|485|720">
<row> <rec=1,"James Mitchell",text> | <align="c"><clr="00007F">of </clr> | <align="c">this | <align="r"> <clr="00007F">Parish</clr> </row>
</table>
<table="6000">
<row> Bachelor </row>
<row> <clr="00007F">and</clr><rec=2,"Mary Ann Murdie",text></clr> \| <clr="00007F">of</clr> \| this \| <clr="00007F">Parish</clr> </row>
<row> Spinster </row>
<row> <clr="00007F">were married in this</clr>Church \| By Banns \| <clr="00007F">with Consent of</clr> </row>
<row> <clr="00007F">this</clr> \| Twenty third \| <clr="00007F">Day of</clr> </row>
<row> April<clr="00007F">in the Year One thousand eight hundred and</clr> \| Seventeen </row>
<row> <clr="00007F">By me</clr> \| J.Prout, Curate </row>
<row> <clr="00007F">This Marriage was solemnised between us{</clr> <rec=1,"James Mitchell",text> </row>
<row> <clr="00007F">{</clr> <rec=2,"Mary Ann Murdie",text> </row>
<row> <clr="00007F"> In the Presence of{</clr> \| John Mitchell,
Elizabeth Mitchell </row>
<row> <clr="00007F">No.</clr>32 </row>
</table>
========================================================================================
<table="6000">
<row> <align="c"><font="Old English Text MT","script",0><fs="+4"><clr="00007F">Parish Register of a Marriage</font></fs> </clr> </row>
<row> <align="c"><clr="00007F">MARRIAGE Solemnised in the Parish of </clr>Rainham<clr="00007F"> in the Year </clr>1817 </row>
</table>
<table="4390|405|485|720">
<row> James Mitchell | <align="c"><clr="00007F">of </clr> | <align="c">this | <align="r"> <clr="00007F">Parish</clr> </row>
</table>
<table="6000">
<row> Bachelor </row>
</table>
<table="485|3905|405|485|720">
<row> <clr="00007F">and</clr> | Mary Ann Murdie | <align="c"><clr="00007F">of</clr> | <align="c">this | <align="r"><clr="00007F">Parish</clr> </row>
</table>
<table="6000">
<row> Spinster </row>
</table>
<table="1620|840|2190|1350">
<row> <clr="00007F">were married in this</clr> | Church | By Banns | <align="r"><clr="00007F">with Consent of</clr> </row>
</table>
<table="3395|485|1400|720">
<row> | <align="c"><clr="00007F">this</clr> | Twenty third | <align="r"><clr="00007F">Day of</clr> </row>
</table>
<table="980|3670|1350">
<row> April | <clr="00007F">in the Year One thousand eight hundred and</clr> | Seventeen </row>
</table>
<table="1420|690|3890">
<row> | <align="c"><clr="00007F">By me</clr> | J.Prout, Curate </row>
</table>
<table="3200|2800">
<row> <clr="00007F">This Marriage was solemnised between us | {</clr> James Mitchell </row>
<row> | <clr="00007F">{</clr> Mary Ann Murdie </row>
</table>
<table="1580|200|4220">
<row> <clr="00007F"> In the Presence of | {</clr> | John Mitchell,
Elizabeth Mitchell </row>
</table>
<table="460|5540">
<row> <clr="00007F">No.</clr> | 32 </row>
</table>