There was a problem earlier that was badly handled. They accused a number of players of "illegitimate play" and refused to pay out. They never explained what the problems were, but indicated it was an "inventive" scheme, or system, that some players had used to "cheat" at the casino. They also stated it was nothing to do with the usual scams, such as "bonus abuse" or multiple account frauds. They even seemed to be refusing to pay players who had not even taken a bonus in the first case.
In the end, they paid out after "pressure from the wider gaming community", with suggestions that eCogra found in player's favour in the cases they looked at. While they paid, they insisted they had been right in their initial actions, and would do the same again if other players tried the same tactic. Since this tactic has never been revealed, and has nothing to do with bonuses and multiple accounts, there is no way future players can avoid being caught up again.
The not-recommended status relates to the way the issue was handled rather to the fact it arose in the first place. Handling included refusing to respond to complaints, and non-cooperation with casinomeister in some cases.
I never had problems when I played, but I quit playing when this issue started getting out of hand as I worried I might get caught up, and their feeble promotions were not worth the risk.
If they get their act together, and convince Bryan that such issues will not arise in future, they will probably go "on probation" for a while and may even win back their former accredited status. Jackpot Factory have already achieved this, rogued last year, corrected the issues, won back their eCogra seal and accredited status.
If you have played with them a while, and never had problems, it is likely this state of affairs will continue and you should not have any trouble. Many of the players caught up in the recent issue were new sign-ups.