imp 4.2 problem with delete and compose (valid for 0 seconds)

After upgrading to 4.2 we had problems deleting emails, from dimp there was no problem, but imp would complain that the link you tried was only valid for 0 seconds. The fix on this page solved that: http://lists.horde.org/archives/imp/Week-of-Mon-20080526/049140.html Mainly, put these lines in horde/imp/config/conf.php: $conf['server']['cache_folders'] = true; $conf['server']['token_lifetime'] = 1800; $conf['server']['cachejs'] = 'none'; $conf['server']['cachecss'] = 'none'; Additionally, we changed our tokens in horde from sql to file.