Thank you for your prompt reply.
I promptly downloaded what was then the most recent exe file I could find.
I decided to install this, with current
settings, when in some remote
location without Internet
(brave or foolish?).
When I ran it, it told me all of my plugins were not compatible. I ended up with no maps and in the middle of nowhere.
Fortunately I still had an older installation
file, which I ran and it restored me to full functionality.
I totally understand that the beta or development versions might be unstable or have some issues. I didn't expect such a wipeout.
The file I downloaded on 5th January was opencpn-mingw_5.0.522+1.0575fa0_setup.exe
Obviously there have been several updates since then, and I could download the latest. But I am now a little nervous that I may have got the wrong format, or I have done something else wrong.
Thank you so much for your continued input to this brilliant software