As of 19 March - this IDP.Alexa.51 has appeared on my computer as well.
This time it's pointing a finger at a program, that has been on my PC for a year.
'TinySpell' was downloaded from a very good website and used without Avast saying anything.
But since the last definitions update, it says I have this malware and puts it into the 'Virus Chest'.
Have uninstalled the program and have replaced it with an older zipped version - and avast has not screamed once (even scanned it).
Now I've got a file in virus chest, which I cannot delete - any help, please.