diff --git a/core/user.class.php b/core/user.class.php
index aedfadc9..a609ebd5 100644
--- a/core/user.class.php
+++ b/core/user.class.php
@@ -52,7 +52,7 @@ class User {
 				$query = "SELECT * FROM users WHERE name = :name AND md5(pass || :ip) = :sess";
 			}
 			$row = $database->get_row($query, array("name"=>$name, "ip"=>get_session_ip($config), "sess"=>$session));
-			$database->cache->set("user-session-$name-$session", $row, 300);
+			$database->cache->set("user-session-$name-$session", $row, 600);
 		}
 		return is_null($row) ? null : new User($row);
 	}
@@ -65,7 +65,7 @@ class User {
 			if($cached) return new User($cached);
 		}
 		$row = $database->get_row("SELECT * FROM users WHERE id = :id", array("id"=>$id));
-		if($id === 1) $database->cache->set('user-id:'.$id, $row, 300);
+		if($id === 1) $database->cache->set('user-id:'.$id, $row, 600);
 		return is_null($row) ? null : new User($row);
 	}
 
diff --git a/ext/blocks/main.php b/ext/blocks/main.php
index e1329234..afcda058 100644
--- a/ext/blocks/main.php
+++ b/ext/blocks/main.php
@@ -37,7 +37,7 @@ class Blocks extends Extension {
 		$blocks = $database->cache->get("blocks");
 		if($blocks === false) {
 			$blocks = $database->get_all("SELECT * FROM blocks");
-			$database->cache->set("blocks", $blocks, 300);
+			$database->cache->set("blocks", $blocks, 600);
 		}
 		foreach($blocks as $block) {
 			if(fnmatch($block['pages'], implode("/", $event->args))) {
diff --git a/ext/featured/main.php b/ext/featured/main.php
index 0ed6918d..01bf6475 100644
--- a/ext/featured/main.php
+++ b/ext/featured/main.php
@@ -66,7 +66,7 @@ class Featured extends Extension {
 				if($image) { // make sure the object is fully populated before saving
 					$image->get_tag_array();
 				}
-				$database->cache->set("featured_image_object-$fid", $image, 60);
+				$database->cache->set("featured_image_object-$fid", $image, 600);
 			}
 			if(!is_null($image)) {
 				if(class_exists("Ratings")) {
diff --git a/ext/pm/main.php b/ext/pm/main.php
index 6a709afe..20935c90 100644
--- a/ext/pm/main.php
+++ b/ext/pm/main.php
@@ -198,7 +198,7 @@ class PrivMsg extends Extension {
 					WHERE to_id = :to_id
 					AND is_read = :is_read
 			", array("to_id" => $user->id, "is_read" => "N"));
-			$database->cache->set("pm-count-{$user->id}", $count, 60);
+			$database->cache->set("pm-count-{$user->id}", $count, 600);
 		}
 		return $count;
 	}
diff --git a/ext/report_image/main.php b/ext/report_image/main.php
index 2f3ab3dd..20d1d6b3 100644
--- a/ext/report_image/main.php
+++ b/ext/report_image/main.php
@@ -72,11 +72,13 @@ class ReportImage extends Extension {
 				"INSERT INTO image_reports(image_id, reporter_id, reason)
 				VALUES (?, ?, ?)",
 				array($event->image_id, $event->reporter_id, $event->reason));
+		$database->cache->delete("image-report-count");
 	}
 
 	public function onRemoveReportedImage(RemoveReportedImageEvent $event) {
 		global $database;
 		$database->Execute("DELETE FROM image_reports WHERE id = ?", array($event->id));
+		$database->cache->delete("image-report-count");
 	}
 
 	public function onDisplayingImage(DisplayingImageEvent $event) {
@@ -99,6 +101,7 @@ class ReportImage extends Extension {
 	public function onImageDeletion(ImageDeletionEvent $event) {
 		global $database;
 		$database->Execute("DELETE FROM image_reports WHERE image_id = ?", array($event->image->id));
+		$database->cache->delete("image-report-count");
 	}
 
 	protected function install() {
@@ -156,7 +159,7 @@ class ReportImage extends Extension {
 		$count = $database->cache->get("image-report-count");
 		if(is_null($count) || $count === false) {
 			$count = $database->get_one("SELECT count(*) FROM image_reports");
-			$database->cache->set("image-report-count", $count, 60);
+			$database->cache->set("image-report-count", $count, 600);
 		}
 
 		return $count;