Hello!
I know it's a really old bug, but I don't see why always drag along it to every new version...
---> --- Pages -> News Modul -> Add/Modify Group -> Picture: When uploading a picture (a real jpg), the message "you have to upload a jgp or png" comes. On some configuration also some not really nice bug messages like that one occur:
Warning: shell_exec() has been disabled for security reasons in /www/htdocs/w00751ba/framework/functions.php on line 491
Warning: shell_exec() has been disabled for security reasons in /www/htdocs/w00751ba/framework/functions.php on line 491
This message was on a 2.7 installation, but 2.8 RC2 has also this bug.
You can't return to admin after it, you are being redirected to your frontend start page.
So either disable uploading of the group pictures in the news module or fix the problem, but it would be not that nice have it in every new WB version.
Regards Michael