I'm seeing a situation when using TeeChart .NET components and a changed font, where after running for a while (~5-20 days), the charts will start rendering horribly jagged fonts. This is in a web-application built using .NET, which renders the charts to the filesystem, from where they are then later served.
After this bug has occured everything will continue to function perfectly except that the charts look horrible, until I reboot the machine. After a reboot everything looks great again, until after an undetermined amount of time (usually within 2 weeks), the problem occurs again.
The following is an illustration of a chart displaying the bug:
Broken pie chart http://geekp.dk/teechart/ugly.png
The correct rendition of this chart, which was generated right after a reboot attempting to fix the above, is the following:
Correct pie chart http://geekp.dk/teechart/correct.png
The issue is global across charts of all types in the web and always displays for all charts once it has occured (not one at a time or such.)
The font this uses is Calibri, and it is created as follows, and after this the (System.Drawing) Font-object is used to specify the .Name and .Size of the TeeChart "ChartFont" objects.
Font font = new Font("Calibri", 15);
I don't know for a fact that the font has anything to do with this, that's just my guess.
This issue seems to affect all charts created by the machine after it occurs. I have a different web which uses default TeeChart fonts for its charts, which displayed the issue whenever it had occured. However, after moving this website off to another machine, it hasn't displayed this behavior. It still happens on the web using the special font however. This web is also the one generating the most chart-renditions (estimated 1-2 charts every 5 seconds).
Does anyone have any ideas for things to check, or have you seen similar behavior from TeeChart before?
Edit: TeeChart is version 4.0.2010.13051.
