Hi mikeconfer,   Try do the setting below in web.config after you upgrade to asp.net 4.0   <httpRuntime requestValidationMode=″2.0″ />   Regards,   ken

Hi,   Can you post your configuration ?   the <system.web> part ?   I guess your server or your web.config modified the HttpHandler for the ashx file.   Regards, Terry  

Hi basam,       Please set <httpRuntime maxRequestLength=''100000''/> of you web.config   100000=100MB     Regards,   Ken

You need to delete the old clients when upgrading. The following file of the old client files will cause error:   CuteSoft_Client\CuteEditor\web.config.

Hi Eric, does the web.config need to be updated in any way?

I tried this and it works now:   Please add the folllowing entry to your web.config file:   <add key=''CuteChat.DisableZipCompress'' value=''true'' />

Please check your web.config file.   Maybe you set a low value to the upload speed.   <add key=''CuteWebUI.AjaxUploader.UploadSpeedKB'' value=''20'' />   Hope it helps.

Hi,   Please try the setting below in the <appSettings> section of web.config.   <add key="CuteWebUI.AjaxUploader.RewritePath" value="False" />   Regards,   Ken 

beckerben,   Go to CuteSoft_client/CuteEditor folder. If you find a web.config file there, delete it.   \

Did you upgrade from version 5.3?   If so, can you delete the following file?   CuteSoft_Client\CuteEditor\web.config