EZdrummer, PerfectSpace and Studio Instruments Bass Don't Play Nice Together!

Perfect Space uses alot of resources, it may be introducing latency.  You could try raising your latency on your sound card to ease the strain and/or 2) try using a different reverb (non convolution) like Sonitus and see if that fixes things.

As a 3rd option you can freeze your midi tracks at the end of your tracking, then add in Perfect Space, with frozen tracks your PC will not have as much to process and you should not have missing notes

Good luck

rbowser


+1 to LpMike's reply. In my book, one should always bounce MIDI tracks to audio, then begin the next phase of production totally in the audio realm - and that's when plug-ins like reverb come in, not before. No matter how much work you do with MIDI, you really can never trick out the tracks as good as you can once they're rendered to audio. Randy B.

Absolutely agree.  IMO, it ought to be sticky rule #2  (#1, of course, being "Back up often"). 
 
By bouncing midi to audio first, all you're dealing with is audio -- much of the burden is removed (No resource-heavy soft synths using up cpu and memory).