Some time ago, I contacted Spike, who wrote the very popular BogusTrivia game script for Eggdrop. Strange things were happening, after upgrading to Eggrop 1.6.21. Others (thommey, nml_375, and more) from some #eggdrop channels, etc. became involved.
To make a looooong story short, they finally pinned it down, and provided a solution.
(As I understand it, there is no plan to release a 1.6.22, thus every time you compile 1.6.21, you should make this edit before compiling)
Many thanks to all that spent their time on it.
See:
http://forum.egghelp.org/viewtopic.php?p=99349#99349
and read that thread. It is beneficial.
Also see:
http://www.egghelp.org/files.htm#patches
Another link:
http://eggwiki.org/Bugs/Timers
I hope this helps, and saves you some time and headaches.
To make a looooong story short, they finally pinned it down, and provided a solution.
(As I understand it, there is no plan to release a 1.6.22, thus every time you compile 1.6.21, you should make this edit before compiling)
Many thanks to all that spent their time on it.

See:
http://forum.egghelp.org/viewtopic.php?p=99349#99349
and read that thread. It is beneficial.
Also see:
http://www.egghelp.org/files.htm#patches
Quote:For Eggdrop 1.6.21
timerworkaround.patch.gz by thommey New 25/5/12
Resolves a bug in Eggdrop 1.6.21's utimers command which could cause Tcl scripts not to function correctly, as reported in this forum discussion.
Another link:
http://eggwiki.org/Bugs/Timers
I hope this helps, and saves you some time and headaches.