Now What?

There is a demo to try if you are interested. X1 was a version at its beginning. It did have bugs. Since then we have had X2 and X3 and now Sonar 2015. We looking at Sonar 2016 coming out soon. I can tell you CW has done an outstanding job of fixing the bugs.
 
I think those that have been advising upgrading are giving you very good advice.   

konradh
Without understanding what's going on, an upgrade is like kicking the TV to fix the picture.

I hear you. I've geeked with computers and software for many years, gradually becoming the go-to guy among all my friends and relatives when something digital needs fixing. I started off wanting to diagnose exactly what went wrong, but long ago I decided that it was more important to get back to work than to know what the problem actually was. Most of the time it doesn't do any good to know, anyway. So kicking the TV is as good a technique as any in my book, if it works. An upgrade to new Sonar might fix things for you, or, as you hint, it might not. You can accomplish roughly the same thing for free by uninstalling/reinstalling the version you have, and maybe using some kind of registry cleaner to tidy things up there.
 
Other than that, I got nothin'.

Update to Platinum! Stable as a rock on my system. The best version of Sonar yet! Worth every penny! I sound like a Cakewalk commercial. Yikes.

Also even though your concern is stability which is superb in Sonar Platinum. Once you have a look at things like Mix Recall or Patch points or the Drum Replacer I believe strongly you will sound like us in very short order. The list of improvements and new features is lengthy and impressive. Plus there will be no new versions as such. Just constant improvements and features added. That maybe difficult to get ones head around but its what this year is all about. And next year is going to be the same. Its time to upgrade. 

+1 Do the Demo.
What can you loose?

Time to upgrade to Platinum, best Cakewalk program ever!

Oh? Well, if number 2 really IS due to the "Prepare using xxx milisecond buffers" setting,
then perhaps it'll help to say that I had cause to open my X1 recently and I found I'd
needed to set it to 1000ms to get it to work without losing midi notes. And I only used
Session Drummer back then.
 
It was announced back then that, as of X2 (I think?!?), the default value would be
increased to 500ms and it seems still be that in Kingston.

Sorry, this is one of those old issues that come up time and again, I assumed
konradh would be aware of it.

Platinum is leaps and bounds ahead of X1d. So many hundreds of annoying bugs and oddities have been fixed since then. If upgrading is financially viable to you I would advise it strongly. You might have a couple of weeks of "huh" getting to know a new version but pretty soon you'll be wondering how you managed with X1 for so long - Platinum is so much more stable, faster and just works great.

However if you're still against upgrading I would recommend doing a complete removal of everything Sonar related and a fresh install. There have to be X1 uninstall instructions somewhere which tell you what to delete in the registry etc.

You should find the upgrade process pretty easy, intuitive and fairly speedy (depending on your internet speed).
 
Keep us posted with your progress, looking forward to reading about it

konradh
 
With all I have invested in software, a Sonar upgrade, though certainly not cheap, is not a huge investment relatively speaking. 

That comment is what sticks out most for me. I ran X3 in tandem with X1d for a long time because a friend stopped at X1d and I needed to keep it up and running. Just the experience of running them side-by-side for so long made me realize the limitations of X1d and that I would never return to it as a "main stay." Platinum has made a lot of enhancements and bug fixes over X3 even, with a much better response time to show stopping issues due to the new model. X3 had one hot fix IIRC, and Platinum gets them in under two weeks when needed, and can roll back to a previous version.
 
As far as installation, a system restore point as well as a C drive image prior to installation would be highly recommended. I did learn first hand when I rebuilt this machine in July do NOT installed X1 stuff after Platinum (it messed with my staff view font).
 
Another mitigation for potential issues is to do a save as on projects being pulled forward with the version in the title. Just in case something happens, the previous version's cwp is fully in tact and can be completed in that prior version. In your case, please make a habit of doing that save as religiously, such as "[file name from X1d] - Plat-K.cwp" etc.

Sorry for the confusion. I meant to install SONAR versions in sequential order. As you already have X1 installed, installing Platinum is not an issue. In my case I "rushed" installation from X1-through-Platinum, then realized I had to re-install X1. That also caused registry issues installing X1 from scratch after X1 Expanded was installed (the S/N's are different). If you ever get into a rebuild situation from scratch, be sure to install versions you want to use in sequential order.
 
For a simple upgrade from X1->Platinum, you would not notice this and is not an issue.

konradh
 
With all I have invested in software, a Sonar upgrade, though certainly not cheap, is not a huge investment relatively speaking.  It is more that I am a little cowardly about rocking the boat and making things worse, but what the hell: you only live once.
 

What the heck Konradh, walk on the wild side, upgrade! 

Hi Konrad,
 
I completely understand users not wanting to upgrade because of the investment in time esp if they are heavily involved in production and can't afford any downtime. I've seen studios using ancient versions or obsolete software/hardware just because they are used to it. Nothing wrong with it - musicians still use instruments that are 60-70 years old and don't even play that well after all :)
 
Anyway regarding X1 my honest advice is to move on and upgrade. There are literally thousands of bugs that have been fixed since then. You seem to have a decent system set up. I can't see why Platinum won't run leaps and bounds better than X1 on your rig. In fact with all the optimizations I think you will find that it saves you valuable time since many common operations are much faster.
 
Regarding your bugs there were many fixes to snap etc since X1 so if its bugging you (pun intended) upgrading will address this. We haven't heard reports of these issues in Platinum. You shouldn't have to do any setup to your plugins. Installing SONAR won't change that - it will just rescan your plugins using the newer improved/faster scanner. The only thing you may need to tweak there is if you were using custom plugin layouts. You should be able to save and restore those however for the most part. If you want to be really cautious do a system image so you can restore it if for some reason you need to roll back. If you have any issues in Platinum that are genuine bugs there is a high likelihood they will be fixed soon, as compared to X1 which would be never!
 
Good luck.