Re the vanishing posts. It sounds like you're hitting Ctrl A (shortcut to highlight everything) instead of Shift A. Once all the text is highlighted, pressing any other key will replace the highlighted text with whatever you hit, possibly the space bar.
Ctrl Z (undo) or Edit and then Undo should get the text back.
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timeasmymeasure
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Ctrl Z (undo) or Edit and then Undo should get the text back.