Todos los programas de Adobe me piden hacer login al abrirlos y, tras hacer login, se cierran

if you want to make a suggestion to adobe, use https://www.adobe.com/products/wishform.html

I don't want to seem disrespectful, but I think I should be able to use whatever default browser I want.

I use Opera because I feel that its DOM Inspector and Ad Blocker features are superior to other browsers, but I have other browsers installed anyhow—like Google Chrome and Firefox, where I make cross-browser tests of the websites that I build.

I think that this is a bug that you should fix, or you should include a more helpful message for users like me that have encountered this issue, where you specify that your software requires specific default web browsers in order to work correctly, informing your paying clients which ones you support.

yes, opera fails to work with adobe.  use a different updated default browser.

OK, I've managed to uninstall everything, which was particularly difficult this time because it kept asking me to log into the Adobe Creative Cloud app, which would fail most of the times.

One thing I did notice, which I'm posting in case it could be of any importance in you solving this problem, is that, when I reinstalled Creative Cloud, instead of it opening a tab to log in on the Adobe website in my default browser (which is Opera), it opened it in Google Chrome.

Is it possible that the Adobe apps are failing to recognise my login data because it's trying to connect with Google Chrome instead of with my default browser, which is Opera? Do I need to open a logged in tab in Google Chrome in order for your apps to stop giving me this nightmare? 

it sounds like something local to your computer (eg,av) is corrupting your stored credentials.

Oh, and by the way, when I uninstalled all the apps one by one, despite selecting that I wanted to save all the program settings and customisations, I found to my horror that, after reinstalling everything again, all of this had been lost! I lost all of my Photoshop actions created with the exact settings for each of my clients, I lost all my Adobe Media Encoder custom export profiles... Absolute nightmare, it will be really difficult to find out all the settings I needed for each client/project and store them again—only to probably lose them once again, as I have to reinstall all the apps again.

I need a solution, please, so that I don't keep losing all this time (and money). 

Here I am again, 13 days after solving the issue by reinstalling everything, and I have the same error once again: the login isn't working in any of my Adobe applications or, in some cases, when I log in it says that they are unable to verify the status of my subscription.

Do I have to, once again, uninstall all of my Adobe applications (I only installed 12 of them this time, luckily) so that I can uninstall Creative Cloud, and then reinstall everything again? Am I going to have to do this very often? I'm really going to have to question if I'd be better off cancelling my full Adobe Creative Suite subscription and finding an alternative that doesn't cause me all this trouble and repetitive time-wasting.

thanks for the update.