The system crashes if I do the following:

Basic Screen > Add Condition > Select : Descriptive / Security / Symbol

Both the stock.screener.co/ screen and the Home page (screen.co) screens crash and are unresponsive.

The same happens if I try select Symbol without Exchange prefix (also in Descriptive/Security), but does not occur if I select Exchange Code from the same data group.

The problem is that there are tens of thousands of symbols in the database, and your browser is trying to create a really big drop down menu with all of them. You can click on a row in the screener view and exclude a specific symbol using the menu that pops up. There really is no reason to filter for a particular symbol (you could just add it to a watchlist in the upper right of the screen).

Since there are fewer exchange codes, that does not cause the same issue.

OK - makes sense. Thanks