I have the same problem, it works using SourceMod Version: 1.0.0.1618
but when i updated to 1.0.0.1624 it says:
Loaded plugin "../tf/addons/metamod/bin/server_i486.so"
L 10/21/2007 - 10
4:45: -------- Mapchange to cp_dustbowl --------
L 10/21/2007 - 10
4:45: [SM] Unable to load extension "sdktools.ext.so": No such file or directory
L 10/21/2007 - 10
4:45: [SM] Unable to load plugin "basecomm.smx": Required extension "SDKTools" file("sdktools.ext") not running
L 10/21/2007 - 10
4:45: [SM] Unable to load plugin "basefuncommands.smx": Required extension "SDKTools" file("sdktools.ext") not running
L 10/21/2007 - 10
4:45: [SM] Unable to load plugin "basefunvotes.smx": Required extension "SDKTools" file("sdktools.ext") not running
L 10/21/2007 - 10
4:45: [nextmap.smx] Loading maps from file: mapcycle.txt
Im using the latest source metamod version 1.6.0.529
The game is Team Fortress 2