Recently got an upgrade of the Virgin Media Super Hub to the 2ac version. While making sure everything still connected OK, I was unable to connect a Chromecast v1 to the wireless access point.
Compared to the previous Virgin Media router I had, this one has separate configuration areas for 2.4GHz and 5GHz wireless. A bit of messing around with trying to connect the Chromecast to either 2.4GHz and 5GHz wireless appeared fruitless until I dropped down the Wireless Mode setting from the default of up to 144Mbps to up to 54Mbps.
Thinking back on it, I’m pretty sure that it was what the previous Virgin Media router was set to. Hence the reason I hadn’t seen the issue when first configuring the Chromecast a while back. Hopefully this blog post will remind me what I need to do next time I get an upgrade.