Here is the solution until I patch it to 2.0.4. Obviously it's something to do per server.
Open up the file: /plugins/content/jw_sigpro.php (in Joomla 1.5) or /mambots/content/jw_sigpro.php (in Joomla 1.0).
Locate line 98 and replace this block:
// define the template folder path (for overrides)
if(file_exists("{$mosConfig_absolute_path}/templates/{$mainframe->getTemplate()}/html/{$plg_name}/{$thb_template}") && is_dir("{$mosConfig_absolute_path}/templates/{$mainframe->getTemplate()}/html/{$plg_name}/{$thb_template}")){
$templatePath = "{$mosConfig_live_site}/templates/{$mainframe->getTemplate()}/html/{$plg_name}/{$thb_template}";
} else {
$templatePath = "{$mosConfig_live_site}/plugins/content/{$plg_name}/templates/{$thb_template}";
}
with this code:
// define the template folder path (for overrides)
if(file_exists("{$mosConfig_absolute_path}/templates/".$mainframe->getTemplate()."/html/{$plg_name}/{$thb_template}") && is_dir("{$mosConfig_absolute_path}/templates/".$mainframe->getTemplate()."/html/{$plg_name}/{$thb_template}")){
$templatePath = "{$mosConfig_live_site}/templates/".$mainframe->getTemplate()."/html/{$plg_name}/{$thb_template}";
} else {
$templatePath = "{$mosConfig_live_site}/plugins/content/{$plg_name}/templates/{$thb_template}";
}
Save and reload your page.