wp_cache_set($id, $data, $group = 'default', $expire = 0) doesn't call w3-total-cache/lib/W3/Cache/Apc.php but lib/ObjectCache.php has no problems with parameters there, but $group = '0' should be replaced with $group = '' in all /Cache/* files to avoid problems with Object cache. that will be fixed in next release.
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Frederick Townes on "[Plugin: W3 Total Cache] Suggested changes to object caching and transients"
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