There was a while ago
, but it was closed because you couldn't reproduce it and the poster never posted a CAP file demonstrating the problem.
I was doing some testing earlier, and I've found that a basic CAP file that closes on the escape key will lock up Construct for about a minute, but then it will recover. Larger CAPs seem to have no such luck.
EDIT: Here's a mostly blank CAP
that demonstrates a temporary lockup on my computer