>Paul,
>
>I just went through the same last week. I spend about three weeks figuring out why my application would crash under Windows 10 at clients but did not in our lab.
>Finally I got a crash report pointing to a DLL in the temp folders which when I opened turned out to be from the ARG command bars.
>
>I had to re-purchase the library again (as my subscription expired). We did not have a chance yet to confirm whether it resolves the issue at the client though.
>Thanks for noting that the theme is the cause. It at least is something I can forward to clients.
>

Let me know how it works.

Our sub. had expired as well, so I downloaded the latest demo to test with (I figured if it worked we'd then buy a new copy). That version didn't work at all for the customer (it crashed immediately).