Re: I'm getting a message when switching clients - Bad Gateway 502?
I haven't seen any reported case same as yours, Jpgrenier, This is probably a web page issue. I'll help you get rid of it.
To start with isolating this issue, let's open QuickBooks Online using an incognito window. From there, try to switch your clients. If you're able to do it without any errors, let's go back to your main browser, then clear the cache. Too much files or cache affects the program. That's why we require our users to clear them out.
In addition, switching to a different browser can also help fix errors like this (Google Chrome, Internet Explorer, or Mozilla Firefox).