TYPO3 Core

Hi guys

Was told to report this here instead of the bugtracker for Templavoila (http://bugs.typo3.org/view.php?id=18515):

"There seems to be a limit of 47 elements when adding sections in a flexible content element.

When trying to add element no. 48 I get this message:
Validating the security token of this form has failed. Please reload the form and submit it again.

Here is how the tx_templavoila_flex field looks like:

<T3FlexForms>
<data>
<sheet index="sDEF">
<language index="lDEF">
<field index="field_section">
<el index="el">
<section index="1">
<itemType index="field_container">
<el>
<field index="field_title">
.....
<section index="47">
<itemType index="field_container">
.....
</language>
</sheet>
</data>
</T3FlexForms>"

I have tried multiple times with different content inside the element, so I doubt it has something to do with the filesize. Again, it always stops at 47 which is really wierd. Maybe I'm overlooking something really really simple but I can't figure this one out...
Please take a look and see if you can reproduce the problem. The ds.xml is attached to the mantis ticket.

Kind regards,
Einar