Could You try the regular (standard) metamod instead that optimized (p) one?
If that wouldn't help - try to stop the server, download my All-In-One package (the link in my signature), rename Your existing "addons" folder to something like "addons_old", unzip all the crap from All-In-One zip file into main "cstrike" (or "czero") folder (depanding on the mod You are playing). Let overwrite all files. Start the server, enable CSDM and see if that happens too or not. If not - add one by one Your plugins You had in Your "addons_old" folder. If yes - there must be something with Your Steam.
Note:
CS16/CZERO non-steam versions aren't supported. ZBOTs aren't supported.
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The Fullpack of podbot mm V3B22 - 24 apr 2012!!! is available here. The All-In-One 3.2a package - 02 jun 2013 (AMX X 1.8.2 [with ATAC 3.0.1b , CSDM2.1.3c beta, CM OE 0.6.5, podbot mm V3B22c and mm 1.20) is available here. The newest Beta V3B23a (rel. 28 august 2018!!!) is available here.