Hello
  Since I bought in 13.12.18 the Osclass Plugin Plugin, something has happened, my users can no longer register on the site and I talked to my provider he did not make any changes to my server, from all the sites I have only on the europaforsale.ro can not register the users, here I install Cache Osclass Plugin, can you help me?

Try to uncheck the cache for the register page.

Try to uncheck the cache for the register page.

I tried, and now it's uninstalled and deleted and yet somewhere it hangs, probably

So the Cache Plugin problem is so,
  if after installation if you have the bad css style you have to modify, as in the post here:

https://forums.osclasspoint.com/cache-plugin/style-css-broken/

You have to put after each code in theme:

ob_get_contents ()
this one:
ob_end_flush ()

... to enable looping of the output buffer.

then if you no longer want to use the plug-in, you have to go back to the initial data of the files.
search.php, inc.category.php and footer.php

otherwise users can no longer register on your site

ob_end_flush only escape previous ob function, has no effect on functionality

ob_end_flush only escape previous ob function, has no effect on functionality

To me, because I probably have Veronioca theme version 1.1.5 by MB Themes and I can not update to the current version, this is the cause of the problem and has not been solved until I have rewritten back the small portion of the code, maybe if anyone else trouble is good to know, I say, right?

Happy Christmas to everyone

I do not think so as registration form works in all the versions of theme.