I upgraded to 9.4.1 from 9.3 at the start of the week and am having the same problems. I've seen the error 4 times in Pads Logic this morning, like you, at seemingly unrelated times. I've seen a lot of other posts on the fatal runtime error but most seem to occur when performing a specific task. Is there something wrong with the install or is it a big problem mentor are working on?!
Does anyone have any ideas for a fix?