I've been testing Wolfram|Alpha Pro Student for three weeks now, and I've found that quite frequently when doing some types of queries I get a blank response (with no error message).

Today, I tried doing a simple file upload of a CSV to get descriptive statistics out of it:

I then noticed the same happens with almost all the examples for file uploads found here.

Checking the Chrome console for all of these cases I see:

Uncaught TypeError: Cannot read property 'val' of null
    at WebSocket.<anonymous> (bundle.js:15)

While Firefox shows (with the same error too):

SyntaxError: JSON.parse: unexpected character at line 1 column 1 of the JSON data
TypeError: a.relatedQueries[0] is null in bundle.js:15:29391
    startWebSocket https://www.wolframalpha.com/static/bundle.js:15

Adding extra indications to the examples (e.g histogram), using manual text input or logging out don't seem to work either.

I'm running Ubuntu Desktop 19.04 with no issues elsewhere.

Does anyone have any ideas? I tried the feedback page some days ago with no luck.