[2014-01-23 09:48:33] (ERROR @ /paas/c1471/www/core/components/phpthumbsup/model/phpthumbsup/phpthumbsup.class.php : 418) PHP warning: finfo_file(/paas/c1471/www/core/phpthumbsupcache/blog-20130820-veel-schermformaten.c187fd2b7cf4a746af6d43614a4c930d.png): failed to open stream: Bestand of map bestaat niet
[2014-01-23 09:48:33] (ERROR @ /paas/c1471/www/core/components/phpthumbsup/model/phpthumbsup/phpthumbsup.class.php : 421) PHP warning: md5_file(/paas/c1471/www/core/phpthumbsupcache/blog-20130820-veel-schermformaten.c187fd2b7cf4a746af6d43614a4c930d.png): failed to open stream: Bestand of map bestaat niet
[2014-01-23 09:48:33] (ERROR @ /paas/c1471/www/core/components/phpthumbsup/model/phpthumbsup/phpthumbsup.class.php : 422) PHP warning: filemtime(): stat failed for /paas/c1471/www/core/phpthumbsupcache/blog-20130820-veel-schermformaten.c187fd2b7cf4a746af6d43614a4c930d.png
[2014-01-23 09:48:33] (ERROR @ /paas/c1471/www/core/components/phpthumbsup/model/phpthumbsup/phpthumbsup.class.php : 418) PHP warning: finfo_file(/paas/c1471/www/core/phpthumbsupcache/linkedin_logo_1.a6777f8f18f5808dab0824a2cbd2a7ee.jpg): failed to open stream: Bestand of map bestaat niet
[2014-01-23 09:48:33] (ERROR @ /paas/c1471/www/core/components/phpthumbsup/model/phpthumbsup/phpthumbsup.class.php : 421) PHP warning: md5_file(/paas/c1471/www/core/phpthumbsupcache/linkedin_logo_1.a6777f8f18f5808dab0824a2cbd2a7ee.jpg): failed to open stream: Bestand of map bestaat niet
[2014-01-23 09:48:33] (ERROR @ /paas/c1471/www/core/components/phpthumbsup/model/phpthumbsup/phpthumbsup.class.php : 422) PHP warning: filemtime(): stat failed for /paas/c1471/www/core/phpthumbsupcache/linkedin_logo_1.a6777f8f18f5808dab0824a2cbd2a7ee.jpg
This question has been answered by wax100. See the first response.
Update phpThumb to 1.7.11-beta to close security vulnerability
Fix caching of manager menus. Until now, they may not have been ever cached