The following gives me "System.ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index"

var meta = new LinqMetaData();
var c = (from l in meta.Promotion.Where(o => o.PromoProductLink.Any() && o.Active == true) select l).ToList();

It works fine in LinqPAD (even though it's a little slow for some reason)

Driving me nuts all help gladly received!

Which runtime library version are you using?

SD.LLBLGen.Pro.LinqSupportClasses.NET35.dll 2.6.08.0814

Upgrade to the latest build please.

ALso, an exception without stacktrace is useless. So first, try the latest build (customer area) then if the problem persists, post the full stacktrace as well.