X2 has been running great here since installing a couple of months ago but...
 
This morning I noticed on a new project that the step sequence is not keeping accurate time.
 
Can't think of anything I've changer....
 
Any Thoughts
tia
meh

What synth is it driving, and what is the exact nature of the timing errors? It's unusual to get randomness, but a fixed offset (early/late) could have to do with Plug-ins that add latency and need PDC. What if you convert the SS clip to a regular MIDI clip?

Standard stuff....SD3....just a straight 1 measure bass 1&3 and Snare 2&4.
it's the second time around on the snare it that jumps ahead and now for as long as you want to loop it it fights itself.
 
meh

If there are any MIDI FX in the project, anywhere, try removing them (disabling is not enough). There is a bug with MIDI FX that causes some or all of the next measure after the loop region to be played back on all passes after the first. Depending on what's in that measure it can screw up the timing.

EDIT: This bug is a pet peeve of mine because I need MIDI FX in a lot of projects while tracking to block CC123 from my old Roland RD-300s. Fortunately, I just got an RD-700NX, and it doesn't send CC123. Will be retiring the RD-300s as soon as possible!

What's your MIDI buffer set to in preferences? If it's less than 500, try 500. 

While this may not fix your particular problem, it fixes an awful lot of step sequencer timing/missing notes oddities so is worth a try if applicable.

This was an upgradded X1 box so in a fit of desperation I started up X1 and it worked fine.  After doing so I opened up X2 and now it is fine????????????????????????
 
thanks to all
meh