i had empty arrays in the cache, so this check wasn't sufficient to fetch and store...

diff --git a/imp/lib/Mailbox.php b/imp/lib/Mailbox.php
index 957c274..8479a65 100644 (file)
--- a/imp/lib/Mailbox.php
+++ b/imp/lib/Mailbox.php
@@ -189,7 +189,7 @@ class IMP_Mailbox
                         (($preview === 2) ||
                          !$GLOBALS['prefs']->getValue('preview_show_unread') ||
                          !in_array('\\seen', $v['flags']))) {
-                        if (!isset($preview_info[$k])) {
+                        if (empty($preview_info[$k])) {
                             $imp_contents = IMP_Contents::singleton($k . IMP::IDX_SEP . $mbox);
                             if (is_a($imp_contents, 'PEAR_Error')) {
                                 $preview_info[$k] = array('IMPpreview' => '', 'IMPpreviewc' => false);