Reading Custom Subscreen Data...error.

(If this is the wrong section for this kind of stuff, please move this)
Tried to access my quest right now... failed to load. Look here.

Code:

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Decrypting...okay.
Opening...okay.
Reading Header...okay.
Reading Rules...okay.
Reading Strings...okay.
Reading Doors...okay.
Reading DMaps...okay.
Reading Misc. Data...okay.
Reading Misc. Colors...okay.
Reading Game Icons...okay.
Reading Items...okay.
Reading Weapons...okay.
Reading Maps...okay.
Reading Combos...okay.
Reading Combo Aliases...okay.
Reading Color Data...okay.
Reading Tiles...okay.
Reading Tunes...okay.
Reading Cheat Codes...okay.
Reading Init. Data...okay.
Reading Custom Guy Data...okay.
Reading Custom Link Sprite Data...okay.
Reading Custom Subscreen Data...error.

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It only started happening today. I haven't done anything with my subscreen in a long time. And I have have no idea what is causing this. And when I try a second time to try and load it up, ZQuest crashes (as well as the player. I tried that as well).
Help would be appreciated. Thanks in advance.

Oh, no! If I am not mistaken, this is the third time this has happened. Hate to say it, but I think noting can be done about. What were you doing right before you saved the file last?

Definetly not editing the subscreen. I think I was building a dungeon. Thankfully only a few things were lost that weren't in a different save file (namely some dungeon rooms and SD's treetops)
I'm just really annoyed. Now we all know to keep backup saves (if we didn't already).

Have you got it on the setting where it keeps those timed saves? I believe the files are called .qt0, .qt1 and .qt2. If you change that extension to .qst, it should load up fine.