Since Xbox Live's scheduled maintenance ended this morning, gamers playing Halo 3 have noticed that TrueSkill and EXP are not being rewarded properly (which is to say, EXP is not being rewarded at all). We are currently working with the Xbox Live team to identify and resolve this issue, and we hope to have you earning your EXP again as quickly as possible.
Note that this is not the same as an EXP ban. If you have been banned from gaining EXP for boosting as part of our recently evolved Banhammer, you will receive a message informing you so quite clearly from the game itself. If you have not seen this message (which reappears often), then you are not banned.
There is nothing further to add at this time, but I will update this post as updates are warranted.
UPDATE: 3:46pm PDT
Further investigation suggests that this is a larger problem with the Xbox Live service that is affecting more games than just Halo 3. We will continue to work with the Xbox team to resolve the issues, but ultimately the ball is in their court, and that rings true for more than just Halo fans.
UPDATE: 6:42pm PDT
Sorry, folks. The Live team is working really hard to resolve issues, but there is no ETA for a complete resolution at this time. Further, when these issues are resolved, there is no guarantee that EXP gained in the interim will be retroactively rewarded. Thanks again for your patience.
UPDATE THE THIRD, OCTOBER THE SECOND IN THE YEAR OF OUR LORD 2008, 9:26am PDT
Hooray! It appears that all issues have been resolved. People playing since late last night should notice that they are now properly being rewarded for EXP.
Unfortunately, EXP earned over the last couple days will not be retroactively rewarded, nor can we adjust TrueSkill for the games played. On the bright side, you can make up lost time by playing this weekend's Double EXP playlist!
Thanks again to everyone for their patience while the matter was resolved.
It would appear that not only have the issues with EXP not been solved, but new issues with matching have arisen. Rest assured that we are aware of what's going on and are doing everything we can to help Microsoft resolve this quickly. We're sorry for the downtime especially in light of the double EXP weekend and we'll update you the moment things are locked down.
It would appear that things are mostly back in order. The Xbox Live team is continuing to work on the problem and hopefully people should see their EXP streaming in at a proper rate soon.