I think I found an engine bug.

Alright, so, it involves tags.

This certain textbox chain involves four tags. It is a talk to chain. One text box is said on one use, then the next time it goes to another, until upon the fourth box, it loops back to the first, and repeats.

Others use three of the same four, with the same method with three tags instead. This causes crashing when it's on the fourth tag.

I just wanted to post this here.
Is this a bug?

Define "crashing." If you mean the window closes, then yes.

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Mega Tact v1.1
Super Penguin Chef
Wizard Blocks

I'm going to throw a random guess as to what might be going on:

When you turn on the tag for one textbox, are you turning off the tag for the textbox that comes afterwards? For example, with a 2-textbox system, you might turn on tag 1 after you see textbox 1 for the first time, which links you to textbox 2. But after you see textbox 2, you turn on tag 2 which links you back to textbox 1, but the tag for textbox 1 is still on, so it sends you back to textbox 2 and you get an infinite loop. So any time you turn on tag 1, you have to turn off tag 2 at the same time and vice versa.

An endless loop of textbox jumps would cause your game to freeze up.

If this is an endless loop of textboxes, then it is not an engine bug, it is a bug in your game. if you describe in more detail how the boxes chain together maybe we can suggest a way to get the effect you want without the endless loop.

If we are mistaken, and this is some other kind of crash, can you post an example so I can try to reproduce it on my own computer?