Hello.

I do not know if I interpret the information correctly, but in my evaluation, there is no clear indication of a memory leak (in .NET managed memory). What I see is that the Heap Size, which was around 134 MB in Snapshot 1, has actually gone slightly down, to cca 126 MB, in Snapshot 7 (after >8 hours). Yes, it has gone up around 4 MB between Snapshot 3 and Snapshot 7, but given the nondeterministic behavior of .NET memory management, that is not a relevant increase. And yes, there is a large number of EasyDAItemChangedEventHandler objects, but the number itself is not a problem, they are short-living objects that can later be disposed.

So let's say the .NET heap size is not actually growing significantly - but the total consumed memory still is. That looks like unmanaged memory leak.
We have seen problems like this caused by a 3rd party component (BoxedApp) that QuickOPC uses. Can you please turn it off and see if the problem is affected? Here are the instructions:

kb.opclabs.com/How_to_disable_prerequisites_boxing

Regards

Hello.

Changes are listed on kb.opclabs.com/Versions (links under Key Changes - What's New Column), but I do not think anything relevant for this issue can be found there.

I suggest to try learn.microsoft.com/en-us/visualstudio/profiling/memory-usage?view=vs-2022 (as a minimum, the type of objects that are not being released should be possible to obtain). However, a reproducible scenario is always option #1.

Regards