Once in a while (even in the middle of the trading day) the price does not get updated for one of my tickers. I then click on it and suddenly it gets updated.
A bit annoying when I'm trying to figure out why Eikon tells me one thing and IB tells me a very different thing.
This tends to resolve if I were to restart TWS. (I tend to keep it working all week long so that may exasperate the problem).