This is now driving me crazy. I had all cal colours set nicely as wanted. Then one morning I noticed one had cal changed, strange I thought. But easily sorted, I set up five dummy vacant colour cals on google and when I found the colour I wanted I hid other cals, opened just the one that had changed itself, re programmed as the new colour (back to it's original colour as on the dummy) .
Then finally changed the name if the dummy cal and deleted the old one that had changed - it had no entries under it by then.
Keeping up? Ha.
BUT it's happened twice more now to cals with many entries so more time consuming and seems to be a bug. Have tried syncing with google and turning off/ on. But I need a fix as I can't have cals changing colour randomly all the time.
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