Clipboard or context menu in the page tree disappeared?
If certain functions are no longer available in the backend after an update to version 4.5 (e.g. the context menu when clicking on a page icon or the clipboard in the list view), this may be due to settings for the defaultUserTSconfig and/or defaultPageTSconfig parameters in the localconf.php file.
If there are entries in the localconf.php file such as
$TYPO3_CONF_VARS['BE']['defaultUserTSconfig']='';
$TYPO3_CONF_VARS['BE']['defaultPageTSconfig']='TCEFORM.pages.TSconfig.linkTitleToSelf=1';
then please delete these (or comment them out). After saving the file localconf.php, delete the files temp_CACHED... in the typo3conf directory and test whether the functions are available again in the backend.
Problems with sending e-mails
In TYPO3 version 4.5 there is a new API for sending emails, SwiftMailer. Various settings can be defined in the install tool under 'All configuration', e.g. whether e-mails should be sent via PHP's mail() function (less recommended as not always reliable) or via an SMTP server with login (recommended).
When using the standard mail form in TYPO3, an error message appears (or a white page if error messages are suppressed) if the forceReturnPath option is set to 1 in the install tool. This option is obsolete since version 4.5 of TYPO3. After an update to 4.5, set forceReturnPath to 0.
Sending e-mails from some extensions may not work because they still have to be converted to the new mail API. The following setting should help here:
$TYPO3_CONF_VARS['MAIL']['substituteOldMailAPI'] = '0';
The problem with sending to multiple recipients (recipient addresses separated by commas) was fixed in version 4.5.1. See bugs.typo3.org/view.php
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