Q1. Ok, so you have the following installed? :
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ESF 1.3 Open Beta (4th-feb-2007)
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AMX Mod X 1.76c (with the 1.76 ESF addon, which is already included in the "Full Installer".)
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Metamod-P 1.19p28
Q2. It worked before with only ESF Open Beta installed, but has stopped working now you have installed AMX Mod X and Metamod?
Q3. Have you modified/changed/added anything? Do you have a fresh install of ESF, Metamod, and AMX Mod X?
Q4. And you installed them in the correct place?
AMX Mod X: "esf_openbeta\addons\amxmodx"
Metamod: "esf_openbeta\addons\metamod"
Metamod-P: "esf_openbeta\addons\metamod\dlls\metamod.dll"
Q5. Did you remove the old "metamod.dll" (official version), and replace it with "metamod.dll" (metamod-p version)?
Q6. Your "esf_openbeta\liblist.gam" should have only one non-commented-out line that begins with "gamedll":
gamedll "addons\metamod\dlls\metamod.dll"
Your "esf_openbeta\addons\metamod\plugins.ini" should have only one non-commented-out line (atm):
win32 addons/amxmodx/dlls/amxmodx_mm.dll
Is that all correct?
Well, it's unlikely anyone can be bothered to read all that... but I'm sure the answer is covered in there somewhere.