ChartDirector sometimes draws crosses, refreshing sometimes shows data

I'm using asp.net and ChartDirector Version 5.

I got a page, generating 3 Charts which is working locally perfect.

After uploading it to my webserver it draws f.e. chart 1 and 3, an leaves chart2 as a blue cross. When i refresh it draws something else, f.e. chart 2 and 3, but leaves chart 1 as a cross. Refreshing is randomly changing which ones are shown, but at least one chart, sometimes a开发者_StackOverflow社区ll.

All charts are using a session ID, to prevent wrong data to be shown

viewer1.ImageSessionId = "xyz" + DateTime.Now.Ticks.ToString();

What are the reasons for that strange behaviour? What can I do?

I'd be glad for every advice :D

Thx, Harry

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see here

its not as difficult as it seems, you'll have to generate tempfiles, using an provided function as mentioned in the link. No big deal, but hard to find.

Greetings,

Harry