X3dx64 PE constantly falls in all cases when the project is loaded, by simply plugging any plug into a clean template. Nothing can be done - Sonar immediately falls. Then how X3c in the same situations is working properly. 
Please excuse my English.
 
Sonar X2x32-X3x64 PE, Win7x64Pro, Yamaha Motif-Rack ES, Alesis Multimix 6FX, KRK RP5.
Host-computer: HP EliteBook 8770w | Core i7 3610QM | 2.3GHz | 24Gb RAM | SSD512+SSD1Tb+HDD500+HDD eSATA 2Tb | RME Fireface UCX | UAD2 Solo/Laptop |
Slave-computer: Vienna Ensemble Pro 5 | Asus P5B Premium | Quad Q6600 2.4GHz | 8Gb RAM | 5*HDDs 3.4Tb | Asus EAH4850 1Gb | ESI Julia + M-Audio FireWire Audiophile | UAD-1, UAD-2 Satellite Quad |

need mo info plz...

By "falls", do you mean it stops working completely? Like a white-screen crash or something?

not one of these threads again ...... 

By "falls", do you mean it stops working completely? Like a white-screen crash or something?

Sorry. Of course, I mean a complete crash, when a pop-up with a proposal to send a message to Cakewalk.

You're saying that you simply insert a plugin into any track in a clean project and Sonar crashes?  If that were true, not a single person in the world would be able to use the program.  Can you provide more info about your system (driver versions, hardware config, audio interface, etc) and maybe we can help you diagnose what the actual issue is.
 
Most importantly - what plugs are you trying to use when this crash occurs? 

karma1959
You're saying that you simply insert a plugin into any track in a clean project and Sonar crashes?

Yes.

Can you provide more info about your system (driver versions, hardware config, audio interface, etc) and maybe we can help you diagnose what the actual issue is.

Win7x64 Pro SP1.
Notebook HP EliteBook 8770w | Core i7 3610QM | 2.3GHz | 24Gb RAM | SSD128+HDD500+eSATA 2Tb |
M-Audio Fast Track Ultra.
UAD2 Solo/Laptop.
All drivers are the latest, freshest, current.

Most importantly - what plugs are you trying to use when this crash occurs?

Any...

exeRsysT
X3dx64 PE constantly falls in all cases when the project is loaded, by simply plugging any plug into a clean template. Nothing can be done - Sonar immediately falls. Then how X3c in the same situations is working properly. 
Please excuse my English.
Win7x64Pro, | HP EliteBook 8770w | Core i7 3610QM | 2.3GHz | 24Gb RAM | SSD128+HDD500+eSATA 2Tb | M-Audio Fast Track Ultra | UAD2 Solo/Laptop |

I wonder if it is an install issue - are you saying you have X3c and X3d installed concurrently?

That's really odd.  I'd consider a complete reinstall to ensure something's not corrupted unless anybody else has other ideas to narrow it down.
 
Was Sonar 2 working ok for you (or whatever the previous version was you were using)?

Your situation seems like the patch file you have was not downloaded (or possibly installed) correctly. The first thing I would recommend is re-downloading the X3d patch and reapplying it (right click and run as administrator). Be sure the patch you use is for the version you have.
 
Also please verify that the MD5 hash on the file you downloaded matches what is on that page (at the bottom and re-posted here).
 
For the Producer Edition - (I am assuming PE = Producer Edition)
         (Approx. 626.98 MB, MD5: efa084312df8232e31549804b3fec384 )

I personally use a program called "FastSum" to verify the MD5 hashes, but there are others available. The MD5 hash is a "thumbprint" of the file to ensure what you have in your machine matches the file on the server you got it from. If you happen to still have the X3d patch on your machine, you can also verify the MD5 hash of it to check.