OK disabling BitDefender got the files DL'd without being blocked. But now I'm in a loop - version 40 files downloaded - click to relaunch. It relaunches at version 39. DL version 40 files again - click to relaunch. Relaunches at version 39, etc. etc. UGH.... Guess I'm stuck at 39.xxx

Run the installer, it should solve the problem.

It did for me (eventually). I have also now excluded it in from Bitdefender scanning, so I shouldn't see the file being disinfected time and time again. However, 40 seems to run OK after Bitdefender cleaned it (presumably quarantined), but I'm not sure what this dll actually does.

  I'd like to know how to stop Opera Dev. from doing this.

Control Panel > Default Programs > Set Default Programs > Select Opera > Set the defaults for this program > Mark all but Mailto
Then select Thunderbird and make sure Mailto is selected.
I guess it may help.

I've done that several times, but the problem is that every time Opera Dev. starts up, it changes the mailto default back to itself from whatever I have set it to (in this case, Thunderbird).
It's obviously rewriting the mailto entry in the Registry, and I imagine that it's because Opera might again have a built-in email client. That's fair enough, but my email system in Thunderbird is carefully set up to filter, classify and archive "stuff", and that's the client I plan to keep using for the moment. I'm happy to use an Opera email client (as used to be the case) under some circumstances, but I do not want it to be the default mailto - not least because it will have no connection to my Thunderbird Address Books, where outgoing email addresses are stored by default.

I've now sorted this out. The problem arose because of Settings>Privacy>Handlers, where Gmail was set as a handler site. Delete that and it's now OK.

I'd like to know how to stop Opera Dev. from doing this.

Control Panel > Default Programs > Set Default Programs > Select Opera > Set the defaults for this program > Mark all but Mailto
Then select Thunderbird and make sure Mailto is selected.
I guess it may help.

I've done that several times, but the problem is that every time Opera Dev. starts up, it changes the mailto default back to itself from whatever I have set it to (in this case, Thunderbird).
It's obviously rewriting the mailto entry in the Registry, and I imagine that it's because Opera might again have a built-in email client. That's fair enough, but my email system in Thunderbird is carefully set up to filter, classify and archive "stuff", and that's the client I plan to keep using for the moment. I'm happy to use an Opera email client (as used to be the case) under some circumstances, but I do not want it to be the default mailto - not least because it will have no connection to my Thunderbird Address Books, where outgoing email addresses are stored by default.

Windows 7 Ultimate on 64-bit PC

I rarely use the "mail" dedicated key on my keyboard, as I start my preferred email client (Thunderbird)from the taskbar.

However, I tried using it today, and was surprised that it launched Opera Developer 38.0.2213.0 rather than Thunderbird. A quick look at file associations shows that "mailto" protocol had been reassigned to Opera Developer.

After changing "mailto" back to the Thunderbird default, I started up Opera Dev. again, which immediately grabbed back the "mailto" assignment.

I want to choose which email client I use, and therefore I'd like to know how to stop Opera Dev. from doing this.

I too have this problem, particularly in Wikipedia editing.

I can use the keyboard to edit text in the main Wiki editing window, but when I come to the separate field for entering a description of the edit, I can punch every button on the keyboard and nothing will appear in the way of typed characters.

This is under Win 7 Ultimate.

Win 7 Ultimate, Opera 32.0.1984.25

Using a conventional keyboard, I can edit in the entry area of Wikipedia titles that I author i.e. type and text appears on the screen correctly.
However, when I come to type in the "Edit Summary" field of the Wikipedia entry, no text appears.

This happens only when using the Opera browser, and others all work as expected.
It's more annoying than serious, but I would like to be able to use Opera for Wikipedia edits.