Toolbox seems to crash on a pretty consistent basis, and based on the frequency in which the crashes occur it appears they might be linked with the timing for auto-saving the drawing. (I've tested this with several different auto-save times and it's very consistent with the frequency of the crashes.) I'm not a programmer by any means so I'm not saying that I know the cause or the fix - I'm just giving my observations. But when a crash occurs during the process of drawing sections I will see parts/products start to be drawn, then a lockup, then a crash without a "fatal error" message. My thoughts are that the process for drawing sections might have some "pauses" between steps and that the auto-save can "jump" into those pauses and result in conflicting processes trying to execute at the same time -  and then the crash.

Again, these are my observations, but they've been very consistent with the timing set for auto-save. If I'm drawing a lot of sections and my timing is set to 5 minutes, the crash will occur almost every 5 minutes. If I set it to 30 minutes, the crash will occur almost every 30 minutes. This seems more than just coincidental. I'd love to know if any others have experienced this same issue and to know if Microvellum can take a look into this.

(I used to crash less often when I turn-off auto-save, but if you don't get into the habit of saving often and Toolbox crashes, you'll definitely lose more than several minutes of work... I'd love to keep auto-save on and occur more frequently, but I can't be crashing every 5-10 minutes.)