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My Textpad has recently become unresponsive:
1. It currently loads a maximum of one document. After loading a second document, the first document disappears.
2. Accents such as é, â, etc. are no longer loaded and become ?? or number/letter combinations.

Something in my settings has spontaneously changed. I didn't do this.
How is it possible that the letter è has changed to è since the day before yesterday?

The Unicode value of the character è is E8.
The UTF-8 encoding of this value is the byte sequence C3 AB.
Interpreted as ISO 8859-1 (sometimes called ANSI) this is the character sequence è.
Thus: è = U+00E8 → 0xC3 0xAB = è

It appears that a file containing letters with diacritics has been saved as UTF-8 and subsequently opened as ANSI.

The only reason I can think of that's causing your point 1 is that you have turned off document tabs and the document selector so you can't see the other documents. You should still be able to see them on the Window menu.

For point 2, this happens when the encoding you have selected when opening those documents does not match their contents. You can set the default encoding in the corresponding document class, or individually on the Open File dialog box,