Had to revert back to X3e...

....for now anyway, until I see what the updates will bring.  Still having problems with MIDI notes dropping (primarily drum parts) even after bumping up the midi buffer from 250 to 500.  I checked X3 and the midi buffers were still at 250 (factory setting) and never had any problems with midi notes not playing.
 
Also having the controller panes jump up and down in size drives me nuts.  I have a duel monitor system and have the TV on one screen and the PRV on the other.  I can adjust the controller panes in the PRV to the size I need them, then if I click in the TV...80% of the time the size of the panes will change.
 
I'm confident that these things will be fixed in future updates, but for now I have to revert back to X3.  I really love the fact that I can solo drum pieces in Platinum when using a drummap, but that feature doesn't weigh in enough to balance out the other stuff that's not working correctly at the present time for me.
 
This isn't a rant or a complaint session... :) ... just stating some of the problems I'm having so the bakers will know about them.
 
X3e is working wonderful for me...so I will keep an eye out for the updates and see how it goes. 

alex, ted says the same things are working in x3, why jump to "particular plungins"? this should be a "please use the problem reporter" or moved to the "Problem Reports" forum and split into per-issue threads,according to the handbook :-)

In other words we should all keep our mouths shut, fine by me

Some years ago I had this issue - when midi notes where too short, like below 40 ticks.
This was a plugin issue.
 
Running a CAL script making them at least 40 - it ran fine.
Pads I had at the time could not be told minimum length of notes, like my eDrums can.
 
Other things that you might try, is to render drums. Read about issue in a daw that did not tell plugin it was doing rendering - so plugin felt this is casual and drop notes in some cases. This might be a Sonar issue if longer notes does not help then.(tip to devs if to look into it).
 
Plugins often use less accurate resample algorithms etc when not rendering to save cpu.
 
Don't know if there is a plugin that is easy to test whether Sonar tell plugins if rendering or running realtime?
 
 

Alex with all due respect , I found your reply to pwalpwal  harsh. Sorry, Just me, I was going to offer an idea but for fear of being shot down will opt out. 

(it's only an internet) i do think we're interpreting the handbook differently, alex; the forums are a troubleshooting place, not a debating club
 

Bristol_Jonesey
I'm getting dropped BFD2 notes when playing back in Platinum
 
I've upped my Midi buffers to 1200 but the issue remains

I'm not invalidating what you're experiencing, but for others who might be reading this thread, here are the main reasons I get dropped MIDI notes.

• Buffers not high enough (although 1200 should be enough)
• Several note-ons occurring immediately after note-offs (i.e., one note ends and another begins - there's no space between the notes). I've fixed many dropped notes on drums by a) making sure the notes are long enough because sometimes envelopes need to be coaxed into a "sustain" phase, and (b) changing the duration of all drum notes to 95-97% or so. This gives just enough time for the instrument and/or SONAR to "hear" the note-off prior to the next note-on. If it doesn't register the note-off, it won't register the subsequent note-on. CPU-intensive instruments seem more prone to this but I don't know if the problem is the instrument, SONAR, or an underpowered computer...I just know what fixes it.
• Overlapping notes that feed the same note or channel, for the previous reason.
• A polyphony limit in an instrument (sometimes I have to dig in preferences or whatever to find the correct parameter - multiple decaying cymbals are usually what expose this). 

Sorry I haven't been back on...been in the studio all day.  I worked with X3 today, didn't even open Platinum.  No problems at all working in X3.  I did notice that all of the projects that I opened today...that I had saved in Platinum yesterday had all of the PRV vertical zoom levels maxed out.  IOWs...I had to zoom back up to see my synth bass parts in every project.  Not a big deal...but the settings are saved with the projects when saved in X3.
 
Just minor things that I am sure will get ironed out with updates.
 
The dropped MIDI notes I was experiencing were in my drum tracks using Superior Drummer.  My drum tracks are not very complicated at all...with no overlapping notes.  Just a simple swing beat.  But didn't see a hint of dropped notes today with X3.
 
I'm using a Focusrite 18i20 interface...which has worked flawlessly since I've had it.  I checked for driver updates about a month ago and I was up to date at that point.
 
Thanks for all of the responses and suggestions.  When I get more time to experiment with Platinum I will dive into it again.  In the meantime I will carry on with X3 until I get these projects done.  I'm still excited about all of the features of Platinum I haven't even got to play with yet...!

My mouse wheel causes erratic behavior with some apps.  If I click the wheel into tick mode instead of free, the problems go away.