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Help - Have just tried to load a 1.4 theme (igames_widescreen) into v1.5 with the following result

Template error
Failed to find block 'view_log_files' (#<!-- BEGIN view_log_files -->(.*?)<!-- END view_log_files -->#s) in :

                <div align="center">
                <table cellpadding="0" cellspacing="1">
                        <tr>

                                <td class="admin_menu"><a href="admin.php" title="{ADMIN_TITLE}">{ADMIN_LNK}</a></td>
                                <td class="admin_menu"><a href="catmgr.php" title="{CATEGORIES_TITLE}">{CATEGORIES_LNK}</a></td>
                                <td class="admin_menu"><a href="albmgr.php{CATL}" title="{ALBUMS_TITLE}">{ALBUMS_LNK}</a></td>
                                <td class="admin_menu"><a href="groupmgr.php" title="{GROUPS_TITLE}">{GROUPS_LNK}</a></td>
                                <td class="admin_menu"><a href="usermgr.php" title="{USERS_TITLE}">{USERS_LNK}</a></td>
                                <td class="admin_menu"><a href="banning.php" title="{BAN_TITLE}">{BAN_LNK}</a></td>
                                <td class="admin_menu"><a href="reviewcom.php" title="{COMMENTS_TITLE}">{COMMENTS_LNK}</a></td>
                                </tr><tr>

                                <td class="admin_menu"><a href="picmgr.php" title="{PICTURES_TITLE}">{PICTURES_LNK}</a></td>
                                <td class="admin_menu"><a href="searchnew.php" title="{SEARCHNEW_TITLE}">{SEARCHNEW_LNK}</a></td>
                                <td class="admin_menu"><a href="util.php" title="{UTIL_TITLE}">{UTIL_LNK}</a></td>
                                <td class="admin_menu"><a href="profile.php?op=edit_profile" title="{MY_PROF_TITLE}">{MY_PROF_LNK}</a></td>
<!-- BEGIN documentation -->
                                <td class="admin_menu"><a href="{DOCUMENTATION_HREF}" title="{DOCUMENTATION_TITLE}" target="cpg_documentation">{DOCUMENTATION_LNK}</a></td>
<!-- END documentation -->
                        </tr>
                </table>
                </div>


I get the same result with any v1.4 theme I try to use - can't access anything after this happens and have to reload Coppermine from scratch. Any ideas?

please read the docs, particulary the theme upgrade section

All of the core themes have already been upgraded to 1.5.x such as - http://coppermine-gallery.net/demo/cpg15x/?theme=igames

As Francois has already stated, if you need to upgrade an existing theme then please read carefully through the upgrade docs particularly the extra tokens required.