Error on recording from web front end

[nearvana]

From th new web front end if I try and record a series i get an error:

Server Error in '/' Application.
Object reference not set to an instance of an object.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error:

Line 400: RecordingQuality quality = RecordingQuality.QUALITY_DEFAULT;
Line 401:
Line 402: switch (Request.Params["quality"].ToLower())
Line 403: {
Line 404: case "best":


Source File: d:\Users\Public\NPVR\Web\SearchResults2.aspx.cs Line: 402

Stack Trace:

[NullReferenceException: Object reference not set to an instance of an object.]
N_EWA.SearchResults2.hlRecord_Click(Object sender, EventArgs e) in d:\Users\Public\NPVR\Web\SearchResults2.aspx.cs:402
System.Web.UI.WebControls.LinkButton.OnClick(EventArgs e) +78
System.Web.UI.WebControls.LinkButton.RaisePostBackEvent(String eventArgument) +100
System.Web.UI.WebControls.LinkButton.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +10
System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +13
System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +170
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2863


Version Information: Microsoft .NET Framework Version:2.0.50727.4200; ASP.NET Version:2.0.50727.4016

Single episodes seem to record OK, but this error happens with any combination of parameters on the Search2.aspx page.
I'm running 1.5.19 on 64 bit Vista