I noticed there was a bug in the jOpenSimRegister plugin. I did some research and found the problem after turning Debugging on. I'm running the web server on Ubuntu 18.04, Apache2, php7.2. This is the issue:
Thanks very much for this info, will be added in next version (probably in a month or 2)
The & needs to be removed for php 7.x since it would cause a notice (Only variables should be assigned by reference...), but thanks very much pointing me to this issue