Thread:Project:Support desk/Upgraded old MW site to 1.23.3 and thumbnails stopped working/reply (2)

I seem to be having exactly the same issue. Tried to turn debug on, but not and expert on mediawiki, so not certain where I might find what the issue is, if I at least could figure out where to look:)

Here is the debug log:

Start request GET /mediawiki/index.php/BO_Overview HTTP HEADERS: HOST: 192.168.0.51 CONNECTION: keep-alive CACHE-CONTROL: max-age=0 ACCEPT: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8 USER-AGENT: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/38.0.2125.101 Safari/537.36 ACCEPT-ENCODING: gzip,deflate,sdch ACCEPT-LANGUAGE: en-US,en;q=0.8 COOKIE: mw_installer_session=dnhbad3pn31156n5db7ci8pet7; dbfswikiLoggedOut=1413303798; dbfswikiUserID=1; dbfswikiUserName=Lailaa; dbfswiki_session=vhlg3h0onkkft815eihkg0am37 [caches] main: APCBagOStuff, message: APCBagOStuff, parser: APCBagOStuff [caches] LocalisationCache: using store LCStoreDB Connected to database 0 at localhost Fully initialised Title::getRestrictionTypes: applicable restrictions to BO Overview are {edit,move} [ContentHandler] Created handler for wikitext: WikitextContentHandler User: got user 1 from cache User: loading options for user 1 from override cache. User: logged in from session User: loading options for user 1 from override cache. MessageCache::load: Loading en-gb... got from global cache Unstubbing $wgParser on call of $wgParser::firstCallInit from MessageCache::getParser Parser: using preprocessor: Preprocessor_DOM Unstubbing $wgLang on call of $wgLang::_unstub from ParserOptions::__construct Article::view using parser cache: yes Parser cache options found. ParserOutput cache found. Article::view: showing parser cache contents MessageCache::load: Loading en... got from global cache Title::getRestrictionTypes: applicable restrictions to BO Overview are {edit,move} Title::getRestrictionTypes: applicable restrictions to BO Overview are {edit,move} Title::getRestrictionTypes: applicable restrictions to BO Overview are {edit,move}