Nach meinem Upgrade von 3.0.6 auf 3.1.0 passiert bei mir Folgendes: Öffne ich die Erweiterungsverwaltung, erhalte ich das in 3.1.0 neu eingeführte Fehlerfenster, was mir rät, die error.log-Datei zu durchforsten.
Löscht man den Inserttags-Ordner mit anschliessendem Db-Update, kommt man wieder (wie schon in der 3.0.6) in die Erweiterungsverwaltung hinein.

Code:
29-May-2013 15:31:52 Europe/Paris] PHP Fatal error:  Uncaught exception 'Exception' with message 'Query error: MySQL server has gone away (UPDATE tl_user SET session='a:51:{s:7:\"referer\";a:43:{s:8:\"f521ce0c\";a:2:{s:4:\"last\";s:15:\"contao/main.php\";s:7:\"current\";s:40:\"contao/main.php?do=settings&ref=de7128ff\";}s:8:\"eb550b78\";a:2:{s:4:\"last\";s:15:\"contao/main.php\";s:7:\"current\";s:40:\"contao/main.php?do=settings&ref=de7128ff\";}s:8:\"44eac5d8\";a:2:{s:4:\"last\";s:15:\"contao/main.php\";s:7:\"current\";s:40:\"contao/main.php?do=settings&ref=de7128ff\";}s:8:\"9e6d83a7\";a:2:{s:4:\"last\";s:15:\"contao/main.php\";s:7:\"current\";s:40:\"contao/main.php?do=settings&ref=de7128ff\";}s:8:\"0809206f\";a:2:{s:4:\"last\";s:40:\"contao/main.php?do=settings&ref=de7128ff\";s:7:\"current\";s:43:\"contao/main.php?do=maintenance&ref=9e6d83a7\";}s:8:\"0a797ec8\";a:2:{s:4:\"last\";s:40:\"contao/main.php?do=settings&ref=de7128ff\";s:7:\"current\";s:43:\"contao/main.php?do=maintenance&ref=9e6d83a7\";}s:8:\"c2b77fc7\";a:2:{s:4:\"last\";s:40:\"contao/main.php?do=set in /home/u813188610/public_html/appartement/system/modules/core/library/Contao/Database/Statement.php on line 346
[29-May-2013 15:34:21 Europe/Paris] PHP Fatal error:  Uncaught exception 'Exception' with message 'Query error: MySQL server has gone away (UPDATE tl_user SET session='a:51:{s:7:\"referer\";a:44:{s:8:\"0809206f\";a:2:{s:4:\"last\";s:40:\"contao/main.php?do=settings&ref=de7128ff\";s:7:\"current\";s:43:\"contao/main.php?do=maintenance&ref=9e6d83a7\";}s:8:\"0a797ec8\";a:2:{s:4:\"last\";s:40:\"contao/main.php?do=settings&ref=de7128ff\";s:7:\"current\";s:43:\"contao/main.php?do=maintenance&ref=9e6d83a7\";}s:8:\"c2b77fc7\";a:2:{s:4:\"last\";s:40:\"contao/main.php?do=settings&ref=de7128ff\";s:7:\"current\";s:43:\"contao/main.php?do=maintenance&ref=9e6d83a7\";}s:8:\"4d109037\";a:2:{s:4:\"last\";s:0:\"\";s:7:\"current\";s:30:\"contao/main.php?do=maintenance\";}s:8:\"0dac1653\";a:2:{s:4:\"last\";s:30:\"contao/main.php?do=maintenance\";s:7:\"current\";s:37:\"contao/main.php?do=files&ref=4d109037\";}s:8:\"280a69e9\";a:2:{s:4:\"last\";s:30:\"contao/main.php?do=maintenance\";s:7:\"current\";s:37:\"contao/main.php?do=files&ref=4d109037\";}s:8:\"b5a9a291\";a:2:{s:4:\"last\";s:3 in /home/u813188610/public_html/appartement/system/modules/core/library/Contao/Database/Statement.php on line 346
[29-May-2013 15:34:48 Europe/Paris] PHP Fatal error:  Uncaught exception 'Exception' with message 'Query error: MySQL server has gone away (UPDATE tl_user SET session='a:51:{s:7:\"referer\";a:44:{s:8:\"0dac1653\";a:2:{s:4:\"last\";s:30:\"contao/main.php?do=maintenance\";s:7:\"current\";s:37:\"contao/main.php?do=files&ref=4d109037\";}s:8:\"280a69e9\";a:2:{s:4:\"last\";s:30:\"contao/main.php?do=maintenance\";s:7:\"current\";s:37:\"contao/main.php?do=files&ref=4d109037\";}s:8:\"b5a9a291\";a:2:{s:4:\"last\";s:37:\"contao/main.php?do=files&ref=4d109037\";s:7:\"current\";s:50:\"contao/main.php?do=repository_catalog&ref=280a69e9\";}s:8:\"988270bc\";a:2:{s:4:\"last\";s:0:\"\";s:7:\"current\";s:15:\"contao/main.php\";}s:8:\"584c92db\";a:2:{s:4:\"last\";s:0:\"\";s:7:\"current\";s:15:\"contao/main.php\";}s:8:\"7e61f0c6\";a:3:{s:10:\"tl_article\";s:39:\"contao/main.php?do=article&ref=584c92db\";s:4:\"last\";s:15:\"contao/main.php\";s:7:\"current\";s:39:\"contao/main.php?do=article&ref=584c92db\";}s:8:\"630bbf26\";a:3:{s:10:\"tl_article\";s:39:\"contao/main.php?do=article&re in /home/u813188610/public_html/appartement/system/modules/core/library/Contao/Database/Statement.php on line 346
[29-May-2013 15:44:28 Europe/Paris] PHP Fatal error: Uncaught exception 'Exception' with message 'Query error: MySQL server has gone away (INSERT INTO tl_log (tstamp, source, action, username, text, func, ip, browser) VALUES(1369835068, 'BE', 'CRON', 'admin', 'Generated the language cache', 'Automator generateLanguageCache()', '90.42.181.0', 'Mozilla/5.0 (Windows NT 5.1; rv:21.0) Gecko/20100101 Firefox/21.0'))' thrown in /home/u813188610/public_html/appartement/system/modules/core/library/Contao/Database/Statement.php on line 346
#0 /home/u813188610/public_html/appartement/system/modules/core/library/Contao/Database/Statement.php(261): Contao\Database\Statement->query()
#1 /home/u813188610/public_html/appartement/system/modules/core/library/Contao/System.php(159): Contao\Database\Statement->execute(1369835068, 'BE', 'CRON', 'admin', 'Generated the l...', 'Automator gener...', '90.42.181.0', 'Mozilla/5.0 (Wi...')
#2 /home/u813188610/public_html/appartement/system/modules/core/library/Contao/Automator.php(670): Contao\System::log('Generated the l...', 'Automator gener...', 'CRON')
#3 /home/u813188610/public_html/appartement/system/modules/core/library/Contao/Automator.php(458): Contao\Automator->generateLanguageCache()
#4 /home/u813188610/public_html/appartement/contao/main.php(89): Contao\Automator->generateInternalCache()
#5 /home/u813188610/public_html/appartement/contao/main.php(270): Main->__construct()
#6 {main}
[29-May-2013 15:44:28 Europe/Paris] PHP Fatal error:  Uncaught exception 'Exception' with message 'Query error: MySQL server has gone away (UPDATE tl_user SET session='a:51:{s:7:\"referer\";a:44:{s:8:\"0dac1653\";a:2:{s:4:\"last\";s:30:\"contao/main.php?do=maintenance\";s:7:\"current\";s:37:\"contao/main.php?do=files&ref=4d109037\";}s:8:\"280a69e9\";a:2:{s:4:\"last\";s:30:\"contao/main.php?do=maintenance\";s:7:\"current\";s:37:\"contao/main.php?do=files&ref=4d109037\";}s:8:\"b5a9a291\";a:2:{s:4:\"last\";s:37:\"contao/main.php?do=files&ref=4d109037\";s:7:\"current\";s:50:\"contao/main.php?do=repository_catalog&ref=280a69e9\";}s:8:\"988270bc\";a:2:{s:4:\"last\";s:0:\"\";s:7:\"current\";s:15:\"contao/main.php\";}s:8:\"584c92db\";a:2:{s:4:\"last\";s:0:\"\";s:7:\"current\";s:15:\"contao/main.php\";}s:8:\"7e61f0c6\";a:3:{s:10:\"tl_article\";s:39:\"contao/main.php?do=article&ref=584c92db\";s:4:\"last\";s:15:\"contao/main.php\";s:7:\"current\";s:39:\"contao/main.php?do=article&ref=584c92db\";}s:8:\"630bbf26\";a:3:{s:10:\"tl_article\";s:39:\"contao/main.php?do=article&re in /home/u813188610/public_html/appartement/system/modules/core/library/Contao/Database/Statement.php on line 346