I have the exact same problem with stuck notes and midi glitches, but I'm using a MOTU micro lite. Although ~ My interface is older than 2 years. Are you telling me that this is probably a problem with an outdated interface ??????
If so that would be MUCH better than having to use the old program because I like the look and feel of Logic X .....
but I'm using an ESQ-M rack .... which is ANCIENT but awesome , I'd hate to leave it behind.