Exiting the application seems to be a good trigger, I'd say 95% of the time when right clicking the tray icon and selecting "Exit Find and Run Robot" I get the exception, but only when FCalc is installed and the troubleshooting log is disabled. The exception pops up 6 times - always the same addresses, then a popup saying "Abnormal program termination". It could actually be 100% of the time, but I'm not certain of that. I'm running portable off a USB stick. The very same stick works without issue on Windows 8, I switch between a few different systems, it's only the Windows 10 installs that are a problem. It does the same thing when run elevated.
It's probably not a big deal, the primary reason it annoys me is because I run off a USB stick. I exit FARR when I need to eject the stick (usually in a hurry), and it crashes almost every time. I disable the troubleshooting log because I sync the USB stick, and I like to keep the list of files that have to be synced every time to a minimum.