Control NPC First Login Issue
 

This is extremely rare but out of thousands of unique logins to Classic over the last 6 months there has been 3 or 4 times where a player has logged on for the first time, and either been completely ignored by the Control NPC script (within onActionPlayerOnline) or about half of the functions have been processed and then abruptly stopped, leaving them to not be setup properly and hindering ability to play.

Do you have observer mode enabled on your server?

It is enabled yes, though for 2 of the people I've seen this happen with they did not enter observer mode, I'm leaning towards the idea that the NPC server going down might have something to do with it.

Observer mode needs to die already, trial accounts on Zodiac (when it was enabled) used to not process a script properly and just updating it would fix it for them.

I think one potentially related issue that may have been occurring as a result of observer mode is that sometimes onActionPlayerOnline is called for their login but the player object cannot be written to, and this is then repeated, out of 331 unique logins there were 2 guest accounts that were somehow duplicated side by side within an SQL database (since fixed to use a unique index).

Other than that there are countless reasons as to why observer mode is such a huge pain in the arse.