>>>Please see attached image,
>>>
>>>I had to put the sequence Quote + Less than inside a PRE tag to save or update the message.
>>
>>Sign starts a HTML tag and not all tags are allowed for security.
>>Use < that is, without spaces, & l t ;
>
>Thank you, Lutz, I forgot about that. Was trying to write "<?", and forgot that the LE engine would interpret this as a HTML tag.
>
>Nevertheless, a warning message would be welcome, instead of a silent no-can-do.

Yeah, its surprising, and for all I remember once there was a warning about illegal chars Test em Tag Test

There is a change, em Tag was not accepted for a long time, now it works, as you can see. We also had a preview, is this gone or just paid accounts?