As the crash logs should indicate I went thought a lot of crashes in a very short period this afternoon as I tried to help resolve a crashing issue for someone else.
The crash was occurring on these lines of code:
I recorded the same as I went through it manually and Panorama came up with:
After adding that to the procedure the crashes have ceased.
Nothing in the documentation indicates that runmodifyfill is required and .ModifyFill does not exist in any of these file. I’ve used FormulalFill all over the place without previously seeing issues. Why it (apparently) caused this crash is puzzling.