No, I've been in my account three different ways today (mobile web, app, and laptop web) with no issues.
I am assuming you did all the normal things to fix the error. Log out, clear cache/cookied, browsing history, etc. Try a different browser and/or a different device. I get error messages all the time and 4 out of 5 can fix it by clearing cache. Same with RCI. Their tracking cookies even when you tell them not to do it, create errors when you do multiple searches.
Yes, I cleared cookies and browsing history.
If you set your browser to block cookies, the website cannot store cookies. But the website may not work.
I have some sites that won't work without them and I am too lazy to go through every site I may go to. It is a pain either way. I usually end up having to clear and get logged out of everything at least every 3 days but sometimes 1 or even 2 times a day. Some sites are set up very friendly to accept only necessary ones (at least that is what they claim), while others make you go in and unselect 4 or 5 options and then still may ask more than once.