(useProxy = true) report withou prameters works ok. Reports with default parameters works first time.
After changing any parameter value and clicking show report button receives message:
Sys.WebForms.PageRequestManagerParserErrorException: The message received from the server could not be parsed. Common causes for this error are when the response is modified by calls to Response.Write(), response filters, HttpModules, or server trace is enabled. Details: Unknown token: '0'.
It looks that the combination of report data and parameter breaks the Radzen proxy code. Could you send us the report definition and DB schema (we don’t need the actual data - just table definitions) at info@radzen.com? This will allow us to troubleshoot.