Check Metamod/plugins.ini
Code:
win32 addons/amxmodx/dlls/amxmodx_mm.dll
linux addons/amxmodx/dlls/amxmodx_mm_i386.so
win32 addons/yapb/dlls/yapb.dll
linux addons/yapb/dlls/yapb.so
Should be inserted
I'm not sure thats what yapb should look like in there.
I haven't installed them for awhile.
Check liblist.gam <open in notepad>
Code:
gamedll "addons\metamod\dlls\metamod.dll"
gamedll_linux "addons/metamod/dlls/metamod_i386.so"
Should be in the gamedll sections.