I can't get ANY server to come up online even the ranked. No BK server shows anyone else with this problem?

that happens to me from time to time...i  gotta restart the game a few times then it will work. for me it do anyway

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Ya, I have about the same problem except some servers will show up but, most do not. I haven't been able to play since May and still haven't fix the problem even with reformatting and reinstall. Let me know if you find out anything.

Honestly no clue try clearing all filters.

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Im starting to smell a bug in their latest update.

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Try right clicking on the Black ops in steam. Click on properties. Select Local files tab and click on" verify integrity of game cache" and let it run. Then run "Defragment  cache files". It worked for me.