2010 Cobalt Reverse Issues

I'm having a strange issue with my 2010 Cobalt. When I put it in reverse, it's not engaging and feels like it's still in park. Neutral works, as does Drive. Any ideas?
It was working fine as we just changed the oil, oil filter, drain plug, and some seal where the harmonic balancer is. Afterwards, it was working just fine. Now all of a sudden, Reverse won't work.
It was working fine as we just changed the oil, oil filter, drain plug, and some seal where the harmonic balancer is. Afterwards, it was working just fine. Now all of a sudden, Reverse won't work.
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