Exactly the same problem here. I went to the trouble of manually importing data and everything looked good. Then the next day all the imported data was gone and had been replaced by the bad data from Alphadvantage.
Thank you very much Mike! I did as you suggested and uninstalled the Moneydance Quote extension (why is it even available if it is damaging, never mind ineffective) and followed the PDF re: installing hleofxquotes and your Security Price Load extension. Works fine with Canadian stocks/exchanges. The only criticism I would have is placement of the help box regarding entering of Moneydance Symbols that differ from the Quote Source Symbols on the bottom of page 3 of the PDF. Would be nice to have it on page 2 when entering the symbols in the hleOfxQuotes window.
I'm getting a bit annoyed now. So the quote downloader that uses Alphadvantage is now useless. OK. So I decide to stop using it, uninstall it, and manually import data from my broker equity by equity. All good. WELL NOT QUITE. I can import the data but whenever I close and reopen Moneydance the data I have imported disappears. WTF. What can I do now. I currently have no way of keeping stock prices up to date.
The problem with keeping prices has been reported in other threads, it is reportedly corrected in a latter preview release but there appears to be a problem in posting this release to the preview site.
Reverting back to the previous stable release should correct the price saving issue for now.