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I had to paraphrase the error from Excel because Superuser doesn't allow "problem" in the title, which is a bit amusing in this case. The actual error, as I'm sure anyone who uses Excel is aware, is this:
There's a problem with the clipboard, but you can still paste your content within this workbook.
I'm not asking how to solve this problem (because based on some Googling I don't think it's possible). In my decades of using computers I don't remember a single other program having problems with the clipboard, so my question is this: Why does it happen? What's the technical reason? Why is Excel different to every other program?
This happens when I'm copying cells in Excel. It doesn't happen (I think) when copying text within a cell (i.e. by editing the cell, selecting the text and copying). I can extremely reliably make it happen by copying a few cells in a row. The cells can contain anything or nothing. If I copy more than 3-5 cells within 10 seconds or so I consistently get the error.
When does Excel say that message? What's in the clipboard when it says it? If you copy something very basic, like a single letter from within Excel or a basic notepad or terminal, does Excel still complain? – Xen2050 – 2019-01-18T05:26:32.347
@Xen2050 Good point, I updated my question. – Clonkex – 2019-01-18T05:31:57.673
Excel doesn't do this on a clean install. There's something else that's involved, likely something that's fiddling with the clipboard. – I say Reinstate Monica – 2019-01-18T05:39:14.223
That sounds like a clue, you have to copy cells one after another very quickly to get the error? Do you have any clipboard managers that could be pasting / saving the clipboard, or other similar programs monitoring the clipboard for stuff (like a downloader looking for URLs)? – Xen2050 – 2019-01-18T05:49:17.317
Other software in PC takes up the clipboard. – Lee – 2019-01-18T09:04:26.183
I agree with the other comments but want to note that you should state your Excel version, because Excel 2016/365 has clipboard changes from earlier versions. Also please note specifics such as your OS or if you're using it in Citrix. Keep in mind that Excel generally uses the "office clipboard" unless another clipboard manager takes precedence, so that could be the source of the issue. – Debra – 2019-01-18T16:05:47.783