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Click on "Customize code" for any component in the graphical editor. Change the "Default Property" to "Custom Property" the hit "DEL" and try to enter any new text. You will only be able to enter 1 letter. This issue is reproducible for me at any time. Without hitting "DEL" I'm able to enter more, but in that case I cannot delete the last letter before the right bracket.
*** This issue has been marked as a duplicate of 91288 ***