Presuming (on windows) you ran a previous version and it worked and the new version doesn't ...
The output of use would be "cgminer -n" and "cgminer -D -T ..." (where ... are the other options you normally use)
[2012-02-07 07:12:29] Started cgminer 2.2.3
[2012-02-07 07:12:29] CL Platform 0 vendor: Advanced Micro Devices, Inc.
[2012-02-07 07:12:29] CL Platform 0 name: AMD Accelerated Parallel Processing
[2012-02-07 07:12:29] CL Platform 0 version: OpenCL 1.1 AMD-APP (898.1)
[2012-02-07 07:12:29] Platform 0 devices: 1
[2012-02-07 07:12:29] Testing pool
http://127.0.0.1:8332 [2012-02-07 07:12:29] Popping work to stage thread
[2012-02-07 07:12:29] Popping work to work thread
[2012-02-07 07:12:29] Successfully retrieved and deciphered work from pool 0
http://127.0.0.1:8332 [2012-02-07 07:12:29] Pushing pooltest work to base pool
[2012-02-07 07:12:29] Pool 0
http://127.0.0.1:8332 active
[2012-02-07 07:12:29] Pushing ping to longpoll thread
[2012-02-07 07:12:29] Pushing work to getwork [2que0u1e2 - 0 2 - 0 7 0 7 : 1 2 : 2 9 ] P u s
hing ping to thread 0
[2012-02-07 07:12:29] Popping work to stage thre[a2d0 1 2 - 0 2 - 0 7 0 7 : 1 2 : 2 9 ] I
nit GPU thread 0 GPU 0 virtual GPU 0
[2012-02-07 07:12:29] CL Platform vendor: Advanced Micro Devices, Inc.
[2012-02-07 07:12:29] CL Platform name: AMD Accelerated Parallel Processing
[2012-02-07 07:12:29] CL Platform version: OpenCL 1.1 AMD-APP (898.1)
[2012-02-07 07:12:29] List of devices:
[2012-02-07 07:12:[2290]1 2N-o0 2l-o0n7g -0p7o:l1l2 :f2o9u]n d 0o nC yapnrye spso o l s e r v e r
[2012-02-07 07:12:29] Selected 0: Cypress
[2012-02-07 07:12:29] Preferred vector width reported 4
[2012-02-07 07:12:29] Max work group size reported 256
[2012-02-07 07:12:29] No binary found, generating from source
[2012-02-07 07:12:29] Setting worksize to 64
[2012-02-07 07:12:29] Patched source to suit 4 vectors
[2012-02-07 07:12:29] cl_amd_media_ops found, setting BITALIGN
[2012-02-07 07:12:29] BFI_INT patch requiring device found, patched source with BFI_INT
[2012-02-07 07:12:29] CompilerOptions: -D WORKSIZE=64 -D VECTORS4 -D BITALIGN -D BFI_INT
[2012-02-07 07:12:29] Error: Building Program (clBuildProgram)
[2012-02-07 07:12:29]
[2012-02-07 07:12:29] Failed to init GPU thread 0, disabling device 0
[2012-02-07 07:12:29] Restarting the GPU from the menu will not fix this.
[2012-02-07 07:12:29] Try restarting cgminer.
[2012-02-07 07:12:29] Init GPU thread 1 GPU 0 virtual GPU 0
[2012-02-07 07:12:29] CL Platform vendor: Advanced Micro Devices, Inc.
[2012-02-07 07:12:29] CL Platform name: AMD Accelerated Parallel Processing
[2012-02-07 07:12:29] CL Platform version: OpenCL 1.1 AMD-APP (898.1)
[2012-02-07 07:12:29] List of devices:
[2012-02-07 07:12:29] 0 Cypress
[2012-02-07 07:12:29] Selected 0: Cypress
[2012-02-07 07:12:29] Preferred vector width reported 4
[2012-02-07 07:12:29] Max work group size reported 256
[2012-02-07 07:12:29] No binary found, generating from source
[2012-02-07 07:12:29] Setting worksize to 64
[2012-02-07 07:12:29] Patched source to suit 4 vectors
[2012-02-07 07:12:29] cl_amd_media_ops found, setting BITALIGN
[2012-02-07 07:12:29] BFI_INT patch requiring device found, patched source with BFI_INT
[2012-02-07 07:12:29] CompilerOptions: -D WORKSIZE=64 -D VECTORS4 -D BITALIGN -D BFI_INT
[2012-02-07 07:12:29] Error: Building Program