2.1.5 => 2.2, config upgrade error, arning: array_merge(): Argument #2 is not ..
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 Tried an upgrade on new box, 2.2 won't accept my config I just downloaded from active 2.1.5. No RRD inside. Got an error Warning: array_merge(): Argument #2 is not an array in /etc/inc/upgrade_config.inc on line 3407 Warning: Cannot modify header information - headers already sent by (output started at /etc/inc/upgrade_config.inc:3407) in /usr/local/www/diag_backup.php on line 545 Will provide a config in PM if needed 
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 If you can PM me the config I'll check it out. 
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 Never mind, config is modified by fellow colleague. Did area-by-area myself. Pinpoint issue, where he modified interfaces part. Transferred to different box and than upgraded the config to 2.2, went well. Sorry for a confusion 
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 Yeah having a broken manually-edited config will do that. :) Glad you found the issue, thanks for the follow up.