Updated to the latest version to rule that out but continue to get the same error in metamod-fatal.log:
Code:
L 09/16/2015 - 19:26:14: Detected engine 11 but could not load: /lib/libm.so.6: version `GLIBC_2.15' not found (required by bin/libvstdlib.so)
L 09/16/2015 - 19:32:26: Detected engine 11 but could not load: /lib/libm.so.6: version `GLIBC_2.15' not found (required by bin/libvstdlib.so)
L 09/16/2015 - 19:38:54: Detected engine 11 but could not load: /lib/libm.so.6: version `GLIBC_2.15' not found (required by bin/libvstdlib.so)
CentOS box that's been working great until tonight.