My conclusion on midi clock.. Arp issue
 

If there is one thing I would ask Access to focus on that would be fixing all the MIDI sync and MIDI clock generation issues such that slaving another synth to the Virus TI works flawlessly. Basically it seems its internally MIDI clock is badly broken - whether you sync to an external clock, or use its internally clock via MIDI.

I don't pretend to know why it's broken, I just don't like it broken.

I said allmost the exact same thing in the ti foum.

If there is one issue that is hard to live with its the broken internal MIDI clock inside the TI.

This seems to affect an patch that uses arps or synced mods and of course results in a very unstable output clock for slaving other synths - on any patch - not just arp patches.

Oddly some patches seem to result in no clock at all, but selecting another patch than going back to the clockless one eventually yields a clock.

As I said in another thread they are working and they hope it will be available shortly. I got the answer from Support...Maybe you guys got the same answer as well :)