The only advice we have for accidents like that is using your backup software or OS to recover old versions of files.
If you can post a .dsv saved just before that scene, we can investigate the touchscreen. I'd say there's a slim chance we have bugs which could break some touchscreen stuff still, especially "painting" type things.
Sorry, I'm quite new to this whole shindig and there are a few terms there I don't get, like what exactly is my "backup software", and what a ".dsv" file is.
But otherwise I'll try and search anything I don't get up on google, and then act on it.
EDIT:
And I checked, I don't think I'm going to be able to recover an old version of the save state for whatever reason.
Any advice?
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