Hello,

Sometimes, I have a general exception on captcha. I do not manage to know why and when it occurs.
If you reach the page many times, you have the image which does not show, with a red cross.
If you refresh, it works...

I have Page Blaster (but normally, I have set "captcha" to none). Is it the problem ?

Error in the eventviewer:

AssemblyVersion: 04.05.01
PortalID: 0
PortalName: Declic Video FX
UserID: -1
UserName:
ActiveTabID: 36
ActiveTabName: Home
RawURL: /DesktopModules/Feedback/ImageChallenge.captcha.aspx?captcha=5564BF76F10A9103833C03D2C476D43C1963745A234123E5E95E0BF37FCF290C40DB28FEF6691A75528FC4CBE599BB1289607B645D71F06
5F8D800AC7A67CBA5EB8B2A525E1BDF9625517EE5BF1D41F7D21E680E8CD1842E28A27B1276E5539D609BE335C8774B02292CE1666F8284C825742
BC7FD45E8074E47B8E6DA6096D5&alias=declic-video-fx.com
AbsoluteURL: /DesktopModules/Feedback/ImageChallenge.captcha.aspx
AbsoluteURLReferrer: http://declic-video-fx.com/Contact.aspx
UserAgent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30)
DefaultDataProvider: DotNetNuke.Data.SqlDataProvider, DotNetNuke.SqlDataProvider
ExceptionGUID: ad628ef4-582e-4bfb-982a-f55762573616
InnerException: Unhandled Error:
FileName:
FileLineNumber: 0
FileColumnNumber: 0
Method: System.Number.StringToNumber
StackTrace:
Message: System.Exception: Unhandled Error: ---> System.FormatException: Input string was not in a correct format. at System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal) at System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo info) at DotNetNuke.UI.WebControls.CaptchaControl.GenerateImage(String encryptedText) at DotNetNuke.UI.WebControls.CaptchaHandler.ProcessRequest(HttpContext context) at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) --- End of inner exception stack trace ---
Source:
Server Name: DEDI524

Any idea ?
Déclic Vidéo FX

I had the same problem... This is how I got mine to work.  I completely disabled pageblaster.  Start with no compression until you get it working, and then add the compression.  Also, disable the whitespace filter as well. 

If you have the word 'captcha' in your exclude pattern then PageBlaster will not get in the way.

It's not a matter of excluding the page that the image is shown on.

The image is generated by another seperate call to the server for this page: DesktopModules/Feedback/ImageChallenge.captcha.aspx