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Good day: I have a problem with a file I have been working on with no trouble during some day: suddenly it won't open anymore and even if its dimension is still more than 90 MB, if TVPaint tries to read it the only thing opens is an empty untitled file.

Can you help me to restore it please?

G

Did you check under the project tab in the timeline?
Since you don't report an error message it could be this:
Maybe you accidentally added a new empty clip in front of the current clip?
When the content is in clip2 or further, TVPaint will always open up in clip1 which makes it look like the entire project is empty.

We will also need additional information, like which version of the software you are using (11.x.y), and your operating system as well.