Generally things have been quiet on the Western front with a few hiccups.  Many voters have had to vote on provisional ballots because of the voter purge confusion or not showing up on voter rolls despite knowing they registered.

One major hiccup coming from Weld County.  There have been reports from Hispanic voters leaving polling location without voting because information is only provided in English ONLY.  Most of the voter information, including ballots were not translated into Spanish.  Some voters have waited at their polling location until a family member arrived that could translate this information.

I experienced something similar in 2006 in Iowa, where I had to translate the entire ballot for a family that could only read in Spanish. There were no pollworkers that could speak Spanish or materials translated.  
Colorado unlike Iowa does not have an English only law.

Colorado blog Square State has more information.