I have just installed the new version 5.0.16. Everything worked fine except for the following 2 problems:
1. In Guru itself I am still the version 5.0.15 offered although 5.0.16 is already installed and is also displayed as the current version.
2. When backing up Joomla I was warned the following folder:
thumbs (in the directory media)
can not be secured. Here I changed the current directory rights from 363 to 755.
Please check if this is ok. And fix the above problems if necessary with the next update ...