I don't remember knowing about pk2 characters (maybe you mean pk3) does that happen when you load other add-ons or does it happen with one that you're doing? If you're making one then you need to make sure the standing sprites have all the rotations set being the names like : STNDA1, STNDA2A8, STNDA3A7, STNDA4A6, STNDA5 if the character looks equal in every rotation. If the character looks different in certain rotations then it needs to be STNDA1, STNDA2, STNDA3, STNDA4, STNDA5, STNDA6, STNDA7, STNDA8. If the problem is with other add-ons not loading then it must be a problem with your srb2 folder or you can give more details about what happens when you load then and if you got the recent version.