I have moved a client website with 3.8 ( from github rep ) from one to another hosting.
Now after user posts an ad:

Warning: current() expects parameter 1 to be array, null given in /home/f5bgtope/public_html/oc-includes/osclass/emails.php on line 855

Warning: Cannot modify header information - headers already sent by (output started at /home/f5bgtope/public_html/oc-includes/osclass/utils.php:1744) in /home/f5bgtope/public_html/oc-includes/osclass/utils.php on line 1749

and after register user as well:
Warning: current() expects parameter 1 to be array, null given in /home/f5bgtope/public_html/oc-includes/osclass/emails.php on line 1052

Warning: Cannot modify header information - headers already sent by (output started at /home/f5bgtope/public_html/oc-includes/osclass/utils.php:1744) in /home/f5bgtope/public_html/oc-includes/osclass/utils.php on line 1749

But in the same time the ad is posted with no problems, also new user is registered succesefully.

@pipetko
Errors may show up based on PHP version, but I do not think anyone will be fixing problems of 3.8 version.

I was thinking the same, But after updating to your version problem was there as well. I will make another try after few days.

Problem in emails.php represents probably missing email template, those in utils.php is very hard to identify.

Problem was emails.php and some corrupted files because of ssd cloud thingy ...

@pipetko
Thanks for your feedback