Crystal Reports Max active instances

I'm having trouble loading (several) multiple instances of crystal's ReportDocuments in memory. Using the following code:

Dim sRPT As New ReportDocument
sRPT.Load("PATH\TO\MY.RPT")

Dim sRPTs As New List(Of ReportDocument)
For i = 0 To 100
    Dim sClone As ReportDocument = sRPT.Clone
    sClone.Refresh()

    sRPTs.Add(sClone)

    Console.WriteLine("RPT Clonado " & i.ToString())
Next

when I reach the 74th instance, the Refresh() call throws a "Report Load failed" exception. Furthermore, the same exception happens even directly calling the .Load(path) method, and affects all ReportDocumetns within the application, regardless the RPT file I'm loading/refreshing.

I'm currently using Crystal XI R2, but testing this code with the v12 assemblies (CR 2008) ended with the same problem.

Has anyone ever stumbled with something like this? The 开发者_StackOverflowreason for all this instances is a report caching for multiple rpt files, per user, and will most likely stay as it is if there is a not-so-nasty workaround for this problem.

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I ran into this before, and AFAIK the only way around it is to make sure you close the reports when you are done with them.