OK, I think I know what this is (at least I know what a similar issue has been in the past). When I do the customization, I like to assign as many advection sites as I can, but my arrays are dimensioned only to 48, so if it tries to grab more than 48 surface advection sites, it generates this error. I always test to try to avoid that possibility, but a few times I’ve missed something, and some extreme curvature of the flow will pick up the extra sites. The solution is for me to (at no charge, of course!) deletes a couple of your advection sites, in the offending direction and flow curvature. I don’t want to do it at random, though, so its best to send me cty.fdt, rgcode.txt, custinit.txt, localdat.txt, localcal.txt, wdata.txt, and latest.txt, as they6 are right after the next time you see the error. It’s a very “chance” thing, so it may not even ever happen again, but if it does, just send those files and I can fix it for you.
Oh, by the way, I see WXSIMATE is version 7.0 in the video. 7.2 is out, and it probably matters, becasue of a lot of URL changes early this year, so I recommend upgrading with www.wxsim.com/wxsimupg.exe.
Thanks!
Tom