Several ETF's have stop updating their historical pricing as of 4/24/18.
When you switch from summary to historical data and export, occassionally the data stops as of 4/24/18. This can be true even with ^GSPC (S&P 500 index). The problem is difficult to replicate and I've observed this on less than 10% of download attempts. I've check my date range numerous times, but the odd behavior is that when the rare incomplete download occurs, it always appears to terminate at April 24, 2018. This matches other export errors when downloading recent prices from "My Portfolio". Did something happen in Yahoo's back-end on April 24, 2018?