Think I found the issue which requires a little hand coding to fix
This is before
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<div style="float:left;">
<img src="../webassist/kfm/themes/webassist_v2/spacer.gif" id="htmleditor_image_1" align="top" />
</div>
<img src="../webassist/kfm/themes/webassist_v2/icon_folder.png" width="20" height="18" id="htmleditor_browse_1" name="{dds:'../', startup_folder:'', show_sidebar:true, width:600, height:400}" style="vertical-align:bottom; padding-bottom:2px; visibility: hidden;" />
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This is after
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<div style="float:left;">
<img src="../webassist/kfm/themes/webassist_v2/spacer.gif" id="htmleditor_image_<?php echo $RepeatSelectionCounter_1; ?>" align="top" />
</div>
<img src="../webassist/kfm/themes/webassist_v2/icon_folder.png" width="20" height="18" id="htmleditor_browse_<?php echo $RepeatSelectionCounter_1; ?>" name="{dds:'../', startup_folder:'', show_sidebar:true, width:600, height:400}" style="vertical-align:bottom; padding-bottom:2px; visibility: hidden;" />
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It appears that when you use the insert or update multiple option it only appends the name of the main input field it misses out the two other img id which also need to be appended,
May be a fix for the next release?