The InterWave SourceBans team has just released another update to the number 1 Sourcemod web admin utility. SourceBans 1.4.3 includes a couple of bug fixes related to Left 4 Dead kicking and banning aswell as a whole bunch of other stuff which you can check by reading the changelog below:

(25/06/09): Version 1.4.3
-----------------------
+ Paginated Submission/Protest (archive)
+ Added password check on email change
+ Improved siteloading speed for adminlist, banlist and banadministration
+ Now supporting as many reasons one likes - paginated those menus
+ Hiding "bans by admin" search when hiding admin names is enabled on banlist
+ Added compileflag to show debugmessages
+ Updated Polish Translations submitted by `Zuko
! Fixed L4D kicking/banning from servers page
! Fixed bans don't get written to the database, if admin isn't in the database
! Fixed "SetPackPosition" error
! Fixed "Banned by" admin name always showing own name in protest email
! Fixed too short server hostnames on serverlist
! Fixed unbanned bans showing up as "Expired"
! Fixed adding br tags to ban/unban reasons
! Fixed 'rcon' column in 'sb_servers' doesn't have default value
! Fixed admins with " ' " in name cause error
! Fixed long words break the submission page
! Fixed not showing old message when editing comment in textarea
! Fixed some random autoquoting problems with IIS in the installer
! Fixed playernames with quotation marks in it show a backslash on the dashboard if banned ingame

Server administrators should update as soon as possible due to security fixes and can grab the latest version from here.