I will make summary of the issue - please confirm if it is correct.
1) You are using LightningChart method SaveToStream() in your application;
2) You set custom size and use SVG format for the exporting of Chart;
3) Application and chart-export work fine at the beginning;
4) At some longer time, application crash with exception - where it seems like TMP folder is filled-up with too many temporal files;
5) version 8 and version 10.4.1 of LightningChart behaves the same way;
6) the Issue is replicated only in some computers;
The last one maybe in particular interesting, as that would indicate likely graphic drivers problem. Intel 11th and 12th Gen. CPU has some problems with DirectX, which we reported for them. By now, the issue we knew should be fixed: user can use latest Intel graphic drivers or workaround described in our
web-page. However, it does not look like issue described here is related.
It seems to me that it is most important to identify when and why temporal files are not deleted.
As I noted before, LightningChart should delete temporal files after successful SaveToStream() operation. Method returns True if succeeded, false otherwise. You can use this flag in application to identify, when something is not going right. Maybe you can get so
_chart.ChartMessage event as well (subscribe to check) - check what message says.
Do you have any bitmap in your chart: Marker, Annotation or Background with bitmap fill or style? Vector format (and SVG in particular) is not very friendly with those. LightningChart may show some warning, if detect such item in the chart before exporting.
Could you share the test application where this export problem is manifested? You can send the project directly to Support.