The error (1002) could mean anything, Sonar is not really pointing to anything (it should!).
You could try sfc /scannow (no harm) but I suspect it won't fix it.
 
I hope the install works, otherwise we need to rule out two things:
* Dodgy plugins (please post a list of your third party plugs)
* Whether the issue is with projects before X3, or are these new X3 projects.

Make sure to clean up the registry before re-installing
Here is a link about how to perform a clean install of X2 http://forum.cakewalk.com/fb.ashx?m=2817470. Other Cakewalk products have similar registry entries.

Ok, Thanks again for everyone's input.
I deleted all files requested and registry entries. Did a clean install with no joy.
I will refer this to tech support if they are open. Thanks again guys!
 
 
Log Name:      Application
Source:        Application Hang
Date:          12/3/2013 7:48:13 AM
Event ID:      1002
Task Category: (101)
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      Jams-PC
Description:
The program SONARX3.exe version 20.0.1.209 stopped interacting with Windows and was closed. To see if more information about the problem is available, check the problem history in the Action Center control panel.
 Process ID: 160c
 Start Time: 01ceefc66cabf67e
 Termination Time: 39
 Application Path: C:\Program Files\Cakewalk\SONAR X3\SONARX3.exe
 Report Id: 5fe284ea-5c21-11e3-9127-3085a98e9788
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="Application Hang" />
    <EventID Qualifiers="0">1002</EventID>
    <Level>2</Level>
    <Task>101</Task>
    <Keywords>0x80000000000000</Keywords>
    <TimeCreated SystemTime="2013-12-03T13:48:13.000000000Z" />
    <EventRecordID>14260</EventRecordID>
    <Channel>Application</Channel>
    <Computer>Jams-PC</Computer>
    <Security />
  </System>
  <EventData>
    <Data>SONARX3.exe</Data>
    <Data>20.0.1.209</Data>
    <Data>160c</Data>
    <Data>01ceefc66cabf67e</Data>
    <Data>39</Data>
    <Data>C:\Program Files\Cakewalk\SONAR X3\SONARX3.exe</Data>
    <Data>5fe284ea-5c21-11e3-9127-3085a98e9788</Data>
    <Binary>430072006F00730073002D0074006800720065006100640000000000</Binary>
  </EventData>
</Event>

Did things seem to work OK with X3a?  (That would have been the install from the download, prior to applying the X3c patch).
 
I am wondering if it is possible to determine if something in the X3c patch is exposing this situation.  If you have opportunity and interest, and had not already found trouble after X3a, you could consider uninstall and install again, this time without applying the X3c patch - then testing to see if things behave differently.
 
The above might provide additional information to tech support (or the forum) on what is happening.
 
Bob Bone

joyof60
I've never used anything but th X3c, and yes it's new projects. Usually playing with session drummer or SI drs when it stops responding. I really hate to keep bothering y'all with this problem. I might get something from cakewalk tech that may help. If so I'll post it here for others! Thanks guys so much!!

20.0.1.209 is not the X3c patch. 
 
You'll need to apply X3c separately:  http://www.cakewalk.com/Support/kb/reader.aspx/2007013331

You don't need any other patches. Just install X3C straight away.
Just reinstall X3C and see what happens (don't worry about it).
After that RESET your VST plugins then scan.
 
Cheers...
 

Hope I'm doing this right. Things have been functional for some time now, occasional crashes continued but nothing I couldn't grin and bear. Alas, now sonar crashes each time I simply try to organize a template. I copied the application error, kinda fuzzy on exactly which one gave anybody information needed to assist.
any ideas again would be great!
 
Thanks in advance for any help!
 
 
 
Log Name:      Application
Source:        Application Error
Date:          8/29/2014 6:43:12 PM
Event ID:      1000
Task Category: (100)
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      Jams-PC
Description:
Faulting application name: SONARX3.exe, version: 20.0.5.244, time stamp: 0x5314d61d
Faulting module name: MSVCR90.dll, version: 9.0.30729.6161, time stamp: 0x4dace4e7
Exception code: 0xc0000417
Fault offset: 0x00000000000552d4
Faulting process id: 0x1fa4
Faulting application start time: 0x01cfc3e0fed47a85
Faulting application path: C:\Program Files\Cakewalk\SONAR X3\SONARX3.exe
Faulting module path: C:\Windows\WinSxS\amd64_microsoft.vc90.crt_1fc8b3b9a1e18e3b_9.0.30729.6161_none_08e61857a83bc251\MSVCR90.dll
Report Id: 3c745de3-2fd6-11e4-8174-3085a98e9788
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="Application Error" />
    <EventID Qualifiers="0">1000</EventID>
    <Level>2</Level>
    <Task>100</Task>
    <Keywords>0x80000000000000</Keywords>
    <TimeCreated SystemTime="2014-08-29T23:43:12.000000000Z" />
    <EventRecordID>23891</EventRecordID>
    <Channel>Application</Channel>
    <Computer>Jams-PC</Computer>
    <Security />
  </System>
  <EventData>
    <Data>SONARX3.exe</Data>
    <Data>20.0.5.244</Data>
    <Data>5314d61d</Data>
    <Data>MSVCR90.dll</Data>
    <Data>9.0.30729.6161</Data>
    <Data>4dace4e7</Data>
    <Data>c0000417</Data>
    <Data>00000000000552d4</Data>
    <Data>1fa4</Data>
    <Data>01cfc3e0fed47a85</Data>
    <Data>C:\Program Files\Cakewalk\SONAR X3\SONARX3.exe</Data>
    <Data>C:\Windows\WinSxS\amd64_microsoft.vc90.crt_1fc8b3b9a1e18e3b_9.0.30729.6161_none_08e61857a83bc251\MSVCR90.dll</Data>
    <Data>3c745de3-2fd6-11e4-8174-3085a98e9788</Data>
  </EventData>
</Event>

It is indeed X3e, I have updated any item that I can find, Not much was out of date, all the drivers proclaim to be the most recent available as well.....I thought something might show up in the event log. I dunno what all that means. Maybe I'll try the Bakers line in the morning. Thanks so much for the reply. really do 'preciate ya!

Thanks Bob,
I have waded through a google search of the above stated terms and really don't see any thing that is common other than the module being at 'fault'.  Last time this resolved to an extent with a reinstall of sonar. Thus resulting in sonar becoming intermittently 'non-responsive' from time to time but not totally crashing and losing my work which is the case now.
This thread is indeed beleaguered with discussion and rants about non related issues, and I do apologize for that but alas, not of my doing.
Thanks so much for any help at all in resolving this issue.
Keith

Get windows update fully up to date including the optional updates which handle C++ libraries. Ta.