Version 6.34.5 has been released in bugfix channel.
You can see changes since previous bugfix version (6.32.4) by looking through changelog starting from 6.33 and up to 6.34.5.
http://www.mikrotik.com/download
Changes since 6.34.4 version:
What's new in 6.34.5 (2016-May-27 11:52):
*) dude - (http://wiki.mikrotik.com/wiki/Manual:Th ... _changelog);
*) dude - in order to connect to dude server user requires dude policy to be enabled;
*) bonding - do not corrupt bonding statistics on configuration changes;
*) bonding - fixed crash when vlan parent mtu is higher than bonding mtu;
*) cloud - do not write minor status changes to storage;
*) ethernet - do not allow mtu to be higher than l2mtu and l2mtu to be higher than max-l2mtu (reduce automatically on upgrade if it was wrong before);
*) ipsec - better flush on proposal change;
*) ipsec - fixed crash on policy update;
*) log - fixed reboot log messages;
*) lte - do not allow to set multiple modes when it is not supported;
*) queue - fixed interface queue type for ovpn tunnels;
*) rb3011 - fixed port flapping on ether6-ether10;
*) rb3011 - fixed time keeping;
*) switch - fixed compact export;
*) tile - fixed performance regression on switch chip (introduced in 6.33rc18);
*) winbox - show voltage in Health only if there actually is voltage monitor;
*) wireless - fixed issue when CAPsMAN could lock CAPs interface;
If you experience version related issues, then please send supout file from your router to support@mikrotik.com. File must be generated while router is not working as suspected or after crash.